diff --git a/js/common/view/FELDeveloperAccordionBox.ts b/js/common/view/FELDeveloperAccordionBox.ts
index a833d4f..f234472 100644
--- a/js/common/view/FELDeveloperAccordionBox.ts
+++ b/js/common/view/FELDeveloperAccordionBox.ts
@@ -14,7 +14,7 @@
 
 import AccordionBox from '../../../../sun/js/AccordionBox.js';
 import faradaysElectromagneticLab from '../../faradaysElectromagneticLab.js';
-import { Node, Text, VBox } from '../../../../scenery/js/imports.js';
+import { HBox, Node, Text, VBox } from '../../../../scenery/js/imports.js';
 import FELConstants from '../../common/FELConstants.js';
 import BooleanProperty from '../../../../axon/js/BooleanProperty.js';
 import Tandem from '../../../../tandem/js/Tandem.js';
@@ -26,28 +26,20 @@ import NumberControl from '../../../../scenery-phet/js/NumberControl.js';
 import PickupCoil from '../model/PickupCoil.js';
 import Electromagnet from '../model/Electromagnet.js';
 import { FELDeveloperNumberControl } from './FELDeveloperNumberControl.js';
-
-// Developer controls are styled independently of controls in the UI, so that we can cram more of them in.
-const CONTROL_FONT_SIZE = 12;
-const CONTROL_FONT = new PhetFont( CONTROL_FONT_SIZE );
-const TEXT_OPTIONS = {
-  font: CONTROL_FONT
-};
-const SUBTITLE_OPTIONS = {
-  font: new PhetFont( {
-    size: CONTROL_FONT_SIZE + 2,
-    weight: 'bold'
-  } )
-};
-const CHECKBOX_OPTIONS = {
-  boxWidth: new Text( 'X', { font: CONTROL_FONT } ).height,
-  tandem: Tandem.OPT_OUT
-};
+import NumberDisplay from '../../../../scenery-phet/js/NumberDisplay.js';
+import TReadOnlyProperty from '../../../../axon/js/TReadOnlyProperty.js';
+import Range from '../../../../dot/js/Range.js';
 
 const VBOX_SPACING = 15;
 
 export default class FELDeveloperAccordionBox extends AccordionBox {
 
+  public static readonly CONTROL_FONT = new PhetFont( 12 );
+  public static readonly SUBTITLE_FONT = new PhetFont( {
+    size: 12,
+    weight: 'bold'
+  } );
+
   protected constructor( content: Node ) {
 
     const titleText = new Text( 'Developer', {
@@ -81,11 +73,15 @@ export default class FELDeveloperAccordionBox extends AccordionBox {
    * Creates the set of controls related to the pickup coil.
    */
   protected static createPickupCoilControls( pickupCoil: PickupCoil ): VBox {
+
     return new VBox( {
       align: 'left',
       spacing: VBOX_SPACING,
       children: [
-        new Text( 'Pickup Coil', SUBTITLE_OPTIONS ),
+        new Text( 'Pickup Coil', {
+          font: FELDeveloperAccordionBox.SUBTITLE_FONT
+        } ),
+        new MaxEMFDisplay( pickupCoil.emfProperty, pickupCoil.maxEMFProperty.range ),
         new FELDeveloperNumberControl( 'Max EMF:', pickupCoil.maxEMFProperty, {
           useCommaSeparator: true
         } ),
@@ -109,7 +105,9 @@ export default class FELDeveloperAccordionBox extends AccordionBox {
       align: 'left',
       spacing: VBOX_SPACING,
       children: [
-        new Text( 'Electromagnet', SUBTITLE_OPTIONS ),
+        new Text( 'Electromagnet', {
+          font: FELDeveloperAccordionBox.SUBTITLE_FONT
+        } ),
         new FELDeveloperNumberControl( 'Current Speed Scale:', electromagnet.coil.currentSpeedScaleProperty, {
           decimalPlaces: 1
         } ),
@@ -121,7 +119,40 @@ export default class FELDeveloperAccordionBox extends AccordionBox {
 
 class FELDeveloperCheckbox extends Checkbox {
   public constructor( labelString: string, property: Property<boolean> ) {
-    super( property, new Text( labelString, TEXT_OPTIONS ), CHECKBOX_OPTIONS );
+    const text = new Text( labelString, {
+      font: FELDeveloperAccordionBox.CONTROL_FONT
+    } );
+    super( property, text, {
+      boxWidth: new Text( 'X', { font: FELDeveloperAccordionBox.CONTROL_FONT } ).height,
+      tandem: Tandem.OPT_OUT
+    } );
+  }
+}
+
+class MaxEMFDisplay extends HBox {
+  public constructor( emfProperty: TReadOnlyProperty<number>, emfRange: Range, decimalPlaces = 0 ) {
+
+    const maxEMFProperty = new NumberProperty( emfProperty.value );
+    emfProperty.link( emf => {
+      if ( emf > maxEMFProperty.value ) {
+        maxEMFProperty.value = emf;
+      }
+    } );
+
+    const maxEMFText = new Text( 'Max EMF:', {
+      font: FELDeveloperAccordionBox.CONTROL_FONT
+    } );
+    const maxEMFNumberDisplay = new NumberDisplay( maxEMFProperty, emfRange, {
+      numberFormatter: value => FELDeveloperNumberControl.formatValue( value, decimalPlaces, true ),
+      textOptions: {
+        font: FELDeveloperAccordionBox.CONTROL_FONT
+      }
+    } );
+
+    super( {
+      children: [ maxEMFText, maxEMFNumberDisplay ],
+      spacing: 5
+    } );
   }
 }
 
diff --git a/js/common/view/FELDeveloperNumberControl.ts b/js/common/view/FELDeveloperNumberControl.ts
index 0f54a99..c1792b4 100644
--- a/js/common/view/FELDeveloperNumberControl.ts
+++ b/js/common/view/FELDeveloperNumberControl.ts
@@ -1,7 +1,7 @@
 // Copyright 2024, University of Colorado Boulder
 
 /**
- * FELDeveloperNumberControl is the number control used in FELDeveloperAccordionBox.
+ * FELDeveloperNumberControl is a NumberControl that is specialized for use in FELDeveloperAccordionBox.
  *
  * @author Chris Malley (PixelZoom, Inc.)
  */
@@ -17,8 +17,8 @@ import Dimension2 from '../../../../dot/js/Dimension2.js';
 import faradaysElectromagneticLab from '../../faradaysElectromagneticLab.js';
 import StrictOmit from '../../../../phet-core/js/types/StrictOmit.js';
 import optionize from '../../../../phet-core/js/optionize.js';
+import FELDeveloperAccordionBox from './FELDeveloperAccordionBox.js';
 
-const CONTROL_FONT = new PhetFont( 12 );
 const TICK_TEXT_OPTIONS = {
   font: new PhetFont( 10 )
 };
@@ -45,8 +45,8 @@ export class FELDeveloperNumberControl extends NumberControl {
 
     const range = numberProperty.range;
 
-    const min = formatValue( range.min, options.decimalPlaces, options.useCommaSeparator );
-    const max = formatValue( range.max, options.decimalPlaces, options.useCommaSeparator );
+    const min = FELDeveloperNumberControl.formatValue( range.min, options.decimalPlaces, options.useCommaSeparator );
+    const max = FELDeveloperNumberControl.formatValue( range.max, options.decimalPlaces, options.useCommaSeparator );
 
     // Tick marks at the extremes of the range
     const majorTicks = [
@@ -73,7 +73,7 @@ export class FELDeveloperNumberControl extends NumberControl {
       delta: sliderStep,
       layoutFunction: createLayoutFunction( resetButton ),
       titleNodeOptions: {
-        font: CONTROL_FONT
+        font: FELDeveloperAccordionBox.CONTROL_FONT
       },
       sliderOptions: {
         soundGenerator: null,
@@ -91,15 +91,25 @@ export class FELDeveloperNumberControl extends NumberControl {
         }
       },
       numberDisplayOptions: {
-        numberFormatter: value => formatValue( value, options.decimalPlaces, options.useCommaSeparator ),
+        numberFormatter: value => FELDeveloperNumberControl.formatValue( value, options.decimalPlaces, options.useCommaSeparator ),
         maxWidth: 100,
         textOptions: {
-          font: CONTROL_FONT
+          font: FELDeveloperAccordionBox.CONTROL_FONT
         }
       },
       tandem: Tandem.OPT_OUT
     } );
   }
+
+  /**
+   * Formats a numeric value, with the option to use a comma separator to make large values more readable.
+   * For example, '6023145' vs '6,023,145'.
+   */
+  public static formatValue( value: number, decimalPlaces: number, useCommaSeparator: boolean ): string {
+    return useCommaSeparator ?
+           Utils.toFixedNumber( value, decimalPlaces ).toLocaleString() :
+           Utils.toFixed( value, decimalPlaces );
+  }
 }
 
 /**
@@ -131,14 +141,4 @@ function createLayoutFunction( resetButton: Node ): LayoutFunction {
   };
 }
 
-/**
- * Formats a numeric value, with the option to use a comma separator to make large values more readable.
- * For example, '6023145' vs '6,023,145'.
- */
-function formatValue( value: number, decimalPlaces: number, useCommaSeparator: boolean ): string {
-  return useCommaSeparator ?
-         Utils.toFixedNumber( value, decimalPlaces ).toLocaleString() :
-         Utils.toFixed( value, decimalPlaces );
-}
-
 faradaysElectromagneticLab.register( 'FELDeveloperNumberControl', FELDeveloperNumberControl );
\ No newline at end of file