diff --git a/src/svelte-components/src/components/DimensionInput.svelte b/src/svelte-components/src/components/DimensionInput.svelte
deleted file mode 100644
index bec8141..0000000
--- a/src/svelte-components/src/components/DimensionInput.svelte
+++ /dev/null
@@ -1,91 +0,0 @@
-<script lang="ts">
-  import TextField from "@smui/textfield";
-  import Select, { Option } from "@smui/select";
-  import type { MenuComponentDev } from "@smui/menu";
-  import Menu from "@smui/menu";
-  import List, { Item, Text } from "@smui/list";
-  import { onMount } from "svelte";
-  import { set_input_value } from "svelte/internal";
-
-  let menu: MenuComponentDev;
-
-  type Option = {
-    value: number;
-    label: string;
-    metric: boolean;
-  };
-
-  export let label: string;
-  export let value: number;
-  export let metric: boolean;
-  export let options: Option[];
-
-  let textValue = "";
-
-  $: if (textValue) {
-    value = Number.parseFloat(textValue) || null;
-  }
-
-  onMount(() => {
-    textValue = value?.toString() || "";
-  });
-
-  function onOptionSelected(option: Option) {
-    textValue = option.value.toString();
-    metric = option.metric;
-  }
-
-  function filterKeys(event) {
-    const input = event.target;
-
-    if (input.value.match(/[^0-9.]/)) {
-      input.value = input.value.replace(/[^0-9.]/g, "");
-    }
-
-    if (input.value.match(/\.[^.]*\./)) {
-      input.value = input.value.replace(/(\.[^.]*)\./g, "$1");
-    }
-  }
-</script>
-
-<div>
-  <div class="value-and-unit">
-    <TextField
-      {label}
-      on:keypress={filterKeys}
-      on:keyup={filterKeys}
-      bind:value={textValue}
-      on:click={() => menu.setOpen(true)}
-    />
-    <Select bind:value={metric}>
-      <Option value={true}>mm</Option>
-      <Option value={false}>in</Option>
-    </Select>
-  </div>
-  <Menu bind:this={menu} anchorCorner="BOTTOM_LEFT">
-    <List>
-      {#each options as option}
-        <Item on:SMUI:action={() => onOptionSelected(option)}>
-          <Text>{option.label}</Text>
-        </Item>
-      {/each}
-    </List>
-  </Menu>
-</div>
-
-<style lang="scss">
-  :global {
-    .value-and-unit {
-      display: flex;
-      column-gap: 10px;
-
-      .mdc-select {
-        max-width: 60px;
-      }
-
-      .smui-select--standard .mdc-select__dropdown-icon {
-        margin-left: 0;
-      }
-    }
-  }
-</style>
\ No newline at end of file
diff --git a/src/svelte-components/src/components/TextFieldWithOptions.svelte b/src/svelte-components/src/components/TextFieldWithOptions.svelte
new file mode 100644
index 0000000..d1d487a
--- /dev/null
+++ b/src/svelte-components/src/components/TextFieldWithOptions.svelte
@@ -0,0 +1,90 @@
+<script lang="ts">
+  import TextField from "@smui/textfield";
+  import Icon from "@smui/textfield/icon";
+  import HelperText from "@smui/textfield/helper-text";
+  import MenuSurface, {
+    type MenuSurfaceComponentDev,
+  } from "@smui/menu-surface";
+  import List, { Item, Text } from "@smui/list";
+  import { virtualKeyboardChange } from "$lib/CustomActions";
+  import { onDestroy } from "svelte";
+
+  let menuSurface: MenuSurfaceComponentDev;
+  let menuTimeout;
+  let optionSelected: boolean = false;
+
+  export let value: string;
+  export let options: string[][];
+  export let valid: boolean;
+  export let helperText: string;
+
+  onDestroy(() => {
+    if (menuTimeout) {
+      clearTimeout(menuTimeout);
+      menuTimeout = undefined;
+    }
+  });
+
+  function showMenu(show: boolean) {
+    if (show && optionSelected) {
+      return;
+    }
+
+    optionSelected = false;
+
+    if (menuTimeout) {
+      clearTimeout(menuTimeout);
+    }
+
+    // Use a timeout to "debounce" the display of the menu.
+    menuTimeout = setTimeout(() => menuSurface.setOpen(show), 100);
+  }
+</script>
+
+<div class="textfield-with-options">
+  <TextField
+    bind:value
+    on:focusin={() => showMenu(true)}
+    on:focusout={() => showMenu(false)}
+    use={[[virtualKeyboardChange, (newValue) => (value = newValue)]]}
+    {...$$restProps}
+  >
+    <div slot="trailingIcon">
+      {#if valid}
+        <Icon class="fa fa-check-circle-o" style="color: green;" />
+      {/if}
+    </div>
+    <HelperText persistent slot="helper">{helperText}</HelperText>
+  </TextField>
+
+  <MenuSurface bind:this={menuSurface} anchorCorner="BOTTOM_LEFT">
+    <div style="display: flex; flex-direction: row;">
+      {#each options as group}
+        <List>
+          {#each group as option}
+            <Item
+              on:SMUI:action={() => {
+                value = option;
+                showMenu(false);
+
+                optionSelected = true;
+              }}
+            >
+              <Text>{option}</Text>
+            </Item>
+          {/each}
+        </List>
+      {/each}
+    </div>
+  </MenuSurface>
+</div>
+
+<style lang="scss">
+  :global {
+    .textfield-with-options {
+      .mdc-deprecated-list-item {
+        height: 35px;
+      }
+    }
+  }
+</style>
diff --git a/src/svelte-components/src/dialogs/ChangeHostnameDialog.svelte b/src/svelte-components/src/dialogs/ChangeHostnameDialog.svelte
index c8463a3..c04a40c 100644
--- a/src/svelte-components/src/dialogs/ChangeHostnameDialog.svelte
+++ b/src/svelte-components/src/dialogs/ChangeHostnameDialog.svelte
@@ -4,7 +4,7 @@
   import TextField from "@smui/textfield";
   import MessageDialog from "$dialogs/MessageDialog.svelte";
   import * as api from "$lib/api";
-  import { virtualKeyboardChangeHelper } from "$lib/customActions";
+  import { virtualKeyboardChange } from "$lib/CustomActions";
 
   // https://man7.org/linux/man-pages/man7/hostname.7.html
   //
@@ -73,7 +73,7 @@
   <Content id="change-hostname-dialog-content">
     <TextField
       bind:value={hostname}
-      use={[[virtualKeyboardChangeHelper, (newValue) => (hostname = newValue)]]}
+      use={[[virtualKeyboardChange, (newValue) => (hostname = newValue)]]}
       label="New Hostname"
       spellcheck="false"
       variant="filled"
diff --git a/src/svelte-components/src/dialogs/ManualHomeAxisDialog.svelte b/src/svelte-components/src/dialogs/ManualHomeAxisDialog.svelte
index 14c4135..b008e83 100644
--- a/src/svelte-components/src/dialogs/ManualHomeAxisDialog.svelte
+++ b/src/svelte-components/src/dialogs/ManualHomeAxisDialog.svelte
@@ -3,7 +3,7 @@
   import TextField from "@smui/textfield";
   import Button, { Label } from "@smui/button";
   import { ControllerMethods } from "$lib/RegisterControllerMethods";
-  import { virtualKeyboardChangeHelper } from "$lib/customActions";
+  import { virtualKeyboardChange } from "$lib/CustomActions";
 
   export let open: boolean;
   export let axis = "";
@@ -31,7 +31,7 @@
       label="Absolute"
       type="number"
       bind:value
-      use={[[virtualKeyboardChangeHelper, (newValue) => (value = newValue)]]}
+      use={[[virtualKeyboardChange, (newValue) => (value = newValue)]]}
       variant="filled"
       style="width: 100%;"
     />
diff --git a/src/svelte-components/src/dialogs/ProbeDialog.svelte b/src/svelte-components/src/dialogs/ProbeDialog.svelte
index cc76844..6559b08 100644
--- a/src/svelte-components/src/dialogs/ProbeDialog.svelte
+++ b/src/svelte-components/src/dialogs/ProbeDialog.svelte
@@ -1,5 +1,4 @@
 <script type="ts">
-  import DimensionInput from "$components/DimensionInput.svelte";
   import Dialog, { Title, Content, Actions } from "@smui/dialog";
   import Button, { Label } from "@smui/button";
   import { waitForChange } from "$lib/StoreHelpers";
@@ -13,14 +12,23 @@
     probingFailed,
     probingStarted,
   } from "$lib/ControllerState";
+  import { numberWithUnit } from "$lib/RegexHelpers";
+  import TextFieldWithOptions from "$components/TextFieldWithOptions.svelte";
 
-  type Step =
-    | "None"
-    | "CheckProbe"
-    | "BitDimensions"
-    | "PlaceProbeBlock"
-    | "Probe"
-    | "Done";
+  const ValidSteps = [
+    "None",
+    "CheckProbe",
+    "BitDimensions",
+    "PlaceProbeBlock",
+    "Probe",
+    "Done",
+  ] as const;
+
+  type Step = typeof ValidSteps[number];
+
+  function isStep(str): str is Step {
+    return ValidSteps.includes(str);
+  }
 
   const stepLabels: Record<Step, string> = {
     None: "",
@@ -34,21 +42,16 @@
   const cancelled = writable(false);
   const userAcknowledged = writable(false);
 
-  const cutterDiameterOptions = [
-    { value: 0.5, label: '1/2 "', metric: false },
-    { value: 0.25, label: '1/4 "', metric: false },
-    { value: 0.125, label: '1/8 "', metric: false },
-    { value: 10, label: "10 mm", metric: true },
-    { value: 6, label: "6 mm", metric: true },
-    { value: 3, label: "10 mm", metric: true },
-  ];
+  const imperialBits = ["1/2 in", "1/4 in", "1/8 in"];
+  const metricBits = ["10 mm", "8 mm", "6 mm", "3 mm"];
 
   export let open;
   export let probeType: "xyz" | "z";
   let currentStep: Step = "None";
-  let cutterDiameter: number;
+  let cutterDiameterString: string = "";
+  let cutterDiameterMetric: number;
   let showCancelButton = true;
-  let steps: Array<Step> = [];
+  let steps: Step[] = [];
   let nextButton = {
     label: "Next",
     disabled: false,
@@ -56,10 +59,12 @@
   };
 
   $: metric = $Config.settings?.units === "METRIC";
+  $: cutterDiameterMetric = numberWithUnit
+    .parse(cutterDiameterString)
+    ?.toMetric();
 
   $: if (open) {
-    cutterDiameter =
-      Number.parseFloat(localStorage.getItem("cutterDiameter")) || null;
+    cutterDiameterString = localStorage.getItem("cutterDiameter") ?? "";
 
     // Svelte appears not to like it when you invoke
     // an async function from a reactive statement, so we
@@ -67,32 +72,31 @@
     requestAnimationFrame(begin);
   }
 
-  $: if (cutterDiameter) {
+  $: if (cutterDiameterString) {
     updateButtons();
   }
 
-  function removeSkippedSteps(steps: Step[]): Step[] {
-    return steps.filter((x) => x);
-  }
-
   async function begin() {
     try {
       $probingActive = true;
       assertValidProbeType();
 
-      steps = removeSkippedSteps([
+      steps = [
         "CheckProbe",
         probeType === "xyz" ? "BitDimensions" : undefined,
         "PlaceProbeBlock",
         "Probe",
         "Done",
-      ]);
+      ].filter<Step>(isStep);
 
       await stepCompleted("CheckProbe", probeContacted);
 
       if (probeType === "xyz") {
         await stepCompleted("BitDimensions", userAcknowledged);
-        localStorage.setItem("cutterDiameter", cutterDiameter.toString());
+        localStorage.setItem(
+          "cutterDiameter",
+          numberWithUnit.normalize(cutterDiameterString)
+        );
       }
 
       await stepCompleted("PlaceProbeBlock", userAcknowledged);
@@ -177,11 +181,7 @@
         break;
 
       case "BitDimensions":
-        nextButton.disabled = !(
-          cutterDiameter !== null &&
-          cutterDiameter !== 0 &&
-          isFinite(cutterDiameter)
-        );
+        nextButton.disabled = !isFinite(cutterDiameterMetric);
         break;
 
       case "Done":
@@ -204,8 +204,8 @@
 
     const cutterLength = 12.7;
     const zLift = 1;
-    const xOffset = probeBlockWidth + cutterDiameter / 2.0;
-    const yOffset = probeBlockLength + cutterDiameter / 2.0;
+    const xOffset = probeBlockWidth + cutterDiameterMetric / 2.0;
+    const yOffset = probeBlockLength + cutterDiameterMetric / 2.0;
     const zOffset = probeBlockHeight;
 
     if (probeType === "z") {
@@ -269,11 +269,11 @@
   scrimClickAction=""
   aria-labelledby="probe-dialog-title"
   aria-describedby="probe-dialog-content"
-  surface$style="width: 700px; height: 400px; max-width: calc(100vw - 32px); overflow: visible;"
+  surface$style="width: 700px; max-width: calc(100vw - 32px);"
 >
   <Title id="probe-dialog-title">Probing {probeType?.toUpperCase()}</Title>
 
-  <Content id="probe-dialog-content" style="overflow: visible;">
+  <Content id="probe-dialog-content">
     <div class="steps">
       <p><b>Step {steps.indexOf(currentStep) + 1} of {steps.length}</b></p>
       <ul>
@@ -282,48 +282,49 @@
         {/each}
       </ul>
     </div>
-    <div class="current-step">
-      <p>
-        {#if currentStep === "CheckProbe"}
-          Attach the probe magnet to the collet, then touch the probe block to
-          the bit.
-        {:else if currentStep === "BitDimensions"}
-          <DimensionInput
-            label="Cutter diameter"
-            options={cutterDiameterOptions}
-            bind:value={cutterDiameter}
-            {metric}
-          />
-        {:else if currentStep === "PlaceProbeBlock"}
+    <p>
+      {#if currentStep === "CheckProbe"}
+        Attach the probe magnet to the collet, then touch the probe block to the
+        bit.
+      {:else if currentStep === "BitDimensions"}
+        <TextFieldWithOptions
+          label="Cutter diameter"
+          variant="filled"
+          spellcheck="false"
+          style="width: 100%;"
+          bind:value={cutterDiameterString}
+          options={[imperialBits, metricBits]}
+          valid={isFinite(cutterDiameterMetric)}
+          helperText={`Examples: 1/2", 10 mm, 0.25 in`}
+        />
+      {:else if currentStep === "PlaceProbeBlock"}
+        {#if probeType === "xyz"}
+          Place the probe block face up, on the lower-left corner of your
+          workpiece.
+        {:else}
+          Place the probe block face down, with the bit above the recess.
+        {/if}
+      {:else if currentStep === "Probe"}
+        Probing in progress...
+      {:else if currentStep === "Done"}
+        {#if $probingFailed}
+          Could not find the probe block during probing!
+
+          <p>
+            Make sure the tip of the bit is less than {metric ? "25mm" : "1 in"}
+            above the probe block, and try again.
+          </p>
+        {:else}
+          Don't forget to put away the probe!
+
           {#if probeType === "xyz"}
-            Place the probe block face up, on the lower-left corner of your
-            workpiece.
-          {:else}
-            Place the probe block face down, with the bit above the recess.
-          {/if}
-        {:else if currentStep === "Probe"}
-          Probing in progress...
-        {:else if currentStep === "Done"}
-          {#if $probingFailed}
-            Could not find the probe block during probing!
+            <p>The machine will now move to the XY origin.</p>
 
-            <p>
-              Make sure the tip of the bit is less than {metric
-                ? "25mm"
-                : "1 in"} above the probe block, and try again.
-            </p>
-          {:else}
-            Don't forget to put away the probe!
-
-            {#if probeType === "xyz"}
-              <p>The machine will now move to the XY origin.</p>
-
-              <p>Watch your hands!</p>
-            {/if}
+            <p>Watch your hands!</p>
           {/if}
         {/if}
-      </p>
-    </div>
+      {/if}
+    </p>
   </Content>
 
   <Actions>
@@ -358,12 +359,9 @@
       flex-direction: row;
     }
 
-    .current-step {
-      flex-grow: 1;
-
-      .mdc-text-field {
-        margin-bottom: 20px;
-      }
+    .bit-dimensions {
+      display: flex;
+      flex-direction: column;
     }
 
     .steps {
diff --git a/src/svelte-components/src/dialogs/SetAxisPositionDialog.svelte b/src/svelte-components/src/dialogs/SetAxisPositionDialog.svelte
index 19c3620..32b2091 100644
--- a/src/svelte-components/src/dialogs/SetAxisPositionDialog.svelte
+++ b/src/svelte-components/src/dialogs/SetAxisPositionDialog.svelte
@@ -3,7 +3,7 @@
   import TextField from "@smui/textfield";
   import Button, { Label } from "@smui/button";
   import { ControllerMethods } from "$lib/RegisterControllerMethods";
-  import { virtualKeyboardChangeHelper } from "$lib/customActions";
+  import { virtualKeyboardChange } from "$lib/CustomActions";
 
   export let open: boolean;
   export let axis = "";
@@ -43,7 +43,7 @@
       label="Position"
       type="number"
       bind:value
-      use={[[virtualKeyboardChangeHelper, (newValue) => (value = newValue)]]}
+      use={[[virtualKeyboardChange, (newValue) => (value = newValue)]]}
       spellcheck="false"
       variant="filled"
       style="width: 100%;"
diff --git a/src/svelte-components/src/dialogs/SetTimeDialog.svelte b/src/svelte-components/src/dialogs/SetTimeDialog.svelte
index 2c39557..25feebb 100644
--- a/src/svelte-components/src/dialogs/SetTimeDialog.svelte
+++ b/src/svelte-components/src/dialogs/SetTimeDialog.svelte
@@ -5,7 +5,7 @@
   import CircularProgress from "@smui/circular-progress";
   import VirtualList from "svelte-tiny-virtual-list";
   import * as api from "$lib/api";
-  import { virtualKeyboardChangeHelper } from "$lib/customActions";
+  import { virtualKeyboardChange } from "$lib/CustomActions";
 
   const itemHeight = 35;
 
@@ -154,9 +154,7 @@
         <Label>Date & Time</Label>
         <TextField
           bind:value
-          use={[
-            [virtualKeyboardChangeHelper, (newValue) => (value = newValue)],
-          ]}
+          use={[[virtualKeyboardChange, (newValue) => (value = newValue)]]}
           label="Time"
           type="datetime-local"
           variant="filled"
diff --git a/src/svelte-components/src/dialogs/WifiConnectionDialog.svelte b/src/svelte-components/src/dialogs/WifiConnectionDialog.svelte
index 8d584b9..644c1e5 100644
--- a/src/svelte-components/src/dialogs/WifiConnectionDialog.svelte
+++ b/src/svelte-components/src/dialogs/WifiConnectionDialog.svelte
@@ -7,7 +7,7 @@
   import MessageDialog from "$dialogs/MessageDialog.svelte";
   import type { WifiNetwork } from "$lib/NetworkInfo";
   import * as api from "$lib/api";
-  import { virtualKeyboardChangeHelper } from "$lib/customActions";
+  import { virtualKeyboardChange } from "$lib/CustomActions";
 
   export let open = false;
   export let network: WifiNetwork;
@@ -57,7 +57,7 @@
     {#if needPassword}
       <TextField
         bind:value={password}
-        use={[[virtualKeyboardChangeHelper, (newValue) => (password = newValue)]]}
+        use={[[virtualKeyboardChange, (newValue) => (password = newValue)]]}
         label="Password"
         spellcheck="false"
         variant="filled"
diff --git a/src/svelte-components/src/lib/CustomActions.ts b/src/svelte-components/src/lib/CustomActions.ts
new file mode 100644
index 0000000..a3a405e
--- /dev/null
+++ b/src/svelte-components/src/lib/CustomActions.ts
@@ -0,0 +1,9 @@
+export function virtualKeyboardChange(node: HTMLElement, cb: (value: any) => void) {
+    const input = node.querySelector("input");
+    if (!input) {
+        console.error("Could not find the textfield's <input>:", node);
+        throw new Error("Could not find the textfield's <input>");
+    }
+
+    input.addEventListener("keyup", () => cb(input.value));
+}
diff --git a/src/svelte-components/src/lib/RegexHelpers.ts b/src/svelte-components/src/lib/RegexHelpers.ts
new file mode 100644
index 0000000..0cd22b2
--- /dev/null
+++ b/src/svelte-components/src/lib/RegexHelpers.ts
@@ -0,0 +1,90 @@
+type NumberWithUnit = {
+    value: number,
+    metric: boolean,
+    toMetric: () => number;
+}
+
+function numberWithUnitToMetric() {
+    return this.metric ? this.value : this.value * 25.4;
+}
+
+function isPojo(value) {
+    if (value === null || typeof value !== "object") {
+        return false;
+    }
+
+    return Object.getPrototypeOf(value) === Object.prototype;
+}
+
+const fractions = [
+    { value: 0.75, formatted: "3/4" },
+    { value: 0.625, formatted: "5/8" },
+    { value: 0.5, formatted: "1/2" },
+    { value: 0.375, formatted: "3/8" },
+    { value: 0.25, formatted: "1/4" },
+    { value: 0.1875, formatted: "3/16" },
+    { value: 0.125, formatted: "1/8" },
+    { value: 0.09375, formatted: "3/32" },
+    { value: 0.0625, formatted: "1/16" },
+    { value: 0.03125, formatted: "1/32" },
+];
+
+function formatFraction(value: number) {
+    const fraction = fractions.find(f => f.value === value);
+
+    return fraction ? fraction.formatted : value.toString();
+}
+
+export const numberWithUnit = {
+    regex: /^\s*(?:(\d+)\s*\/\s*(\d+)|(\d*\.\d+)|(\d+(?:\.\d+)?))\s*("|in|inch|inches|mm|millimeters)\s*$/,
+    parse: function (str: string) {
+        let [, numerator, denominator, decimal1, decimal2, unit]: any = str?.match(numberWithUnit.regex) ?? [];
+
+        numerator = Number.parseFloat(numerator)
+        denominator = Number.parseFloat(denominator)
+        decimal1 = Number.parseFloat(decimal1)
+        decimal2 = Number.parseFloat(decimal2)
+
+        const metric = (unit ?? "").includes("m");
+
+        switch (true) {
+            case isFinite(numerator) && isFinite(denominator):
+                return {
+                    value: numerator / denominator,
+                    metric,
+                    toMetric: numberWithUnitToMetric
+                };
+
+            case isFinite(decimal1) && decimal1 !== 0:
+                return {
+                    value: decimal1,
+                    metric,
+                    toMetric: numberWithUnitToMetric
+                };
+
+            case isFinite(decimal2) && decimal2 !== 0:
+                return {
+                    value: decimal2,
+                    metric,
+                    toMetric: numberWithUnitToMetric
+                };
+
+            default:
+                return undefined;
+        }
+    },
+    normalize: function (str) {
+        const value = this.parse(str);
+
+        switch (true) {
+            case !isPojo(value):
+                return "";
+
+            case value.metric:
+                return `${value.value} mm`
+
+            default:
+                return `${formatFraction(value.value)} in`
+        }
+    }
+}
diff --git a/src/svelte-components/src/lib/customActions.ts b/src/svelte-components/src/lib/customActions.ts
deleted file mode 100644
index 6241f7c..0000000
--- a/src/svelte-components/src/lib/customActions.ts
+++ /dev/null
@@ -1,4 +0,0 @@
-export function virtualKeyboardChangeHelper(node: HTMLElement, cb: (value: any) => void) {
-    const input = node.querySelector("input");
-    input.addEventListener("keyup", () => cb(input.value));
-}
diff --git a/src/svelte-components/vite.config.ts b/src/svelte-components/vite.config.ts
index 15a9cd4..eeb6a0e 100644
--- a/src/svelte-components/vite.config.ts
+++ b/src/svelte-components/vite.config.ts
@@ -15,7 +15,6 @@ export default defineConfig({
     }
   },
   build: {
-    minify: false,
     target: "chrome60",
     lib: {
       entry: resolve(__dirname, 'src/main.ts'),