diff --git a/interface/src/project/DashboardDevices.tsx b/interface/src/project/DashboardDevices.tsx
index 8a337d8ac..e3a9f8701 100644
--- a/interface/src/project/DashboardDevices.tsx
+++ b/interface/src/project/DashboardDevices.tsx
@@ -35,7 +35,7 @@ import DashboarDevicesDialog from './DashboardDevicesDialog';
 import DeviceIcon from './DeviceIcon';
 
 import * as EMSESP from './api';
-import { formatValue, isNumberUOM } from './deviceValue';
+import { formatValue } from './deviceValue';
 
 import { DeviceValueUOM_s, DeviceEntityMask } from './types';
 import { deviceValueItemValidation } from './validators';
@@ -186,12 +186,10 @@ const DashboardDevices: FC = () => {
   );
 
   const fetchDeviceData = async (id: number) => {
-    if (!deviceValueDialogOpen) {
-      try {
-        setDeviceData((await EMSESP.readDeviceData({ id })).data);
-      } catch (error) {
-        toast.error(extractErrorMessage(error, LL.PROBLEM_LOADING()));
-      }
+    try {
+      setDeviceData((await EMSESP.readDeviceData({ id })).data);
+    } catch (error) {
+      toast.error(extractErrorMessage(error, LL.PROBLEM_LOADING()));
     }
   };
 
@@ -208,6 +206,9 @@ const DashboardDevices: FC = () => {
   }, [fetchCoreData]);
 
   const refreshData = () => {
+    if (deviceValueDialogOpen) {
+      return;
+    }
     if (selectedDevice) {
       void fetchDeviceData(selectedDevice);
     } else {
@@ -288,9 +289,10 @@ const DashboardDevices: FC = () => {
   });
 
   const deviceValueDialogSave = async (dv: DeviceValue) => {
+    const selectedDeviceID = Number(device_select.state.id);
     try {
       const response = await EMSESP.writeDeviceValue({
-        id: Number(device_select.state.id),
+        id: selectedDeviceID,
         devicevalue: dv
       });
       if (response.status === 204) {
@@ -304,8 +306,8 @@ const DashboardDevices: FC = () => {
       toast.error(extractErrorMessage(error, LL.PROBLEM_UPDATING()));
     } finally {
       setDeviceValueDialogOpen(false);
+      await fetchDeviceData(selectedDeviceID);
       setSelectedDeviceValue(undefined);
-      refreshData();
     }
   };
 
@@ -515,7 +517,7 @@ const DashboardDevices: FC = () => {
           onClose={deviceValueDialogClose}
           onSave={deviceValueDialogSave}
           selectedItem={selectedDeviceValue}
-          validator={deviceValueItemValidation(isNumberUOM(selectedDeviceValue.u))}
+          validator={deviceValueItemValidation(selectedDeviceValue)}
         />
       )}
 
diff --git a/interface/src/project/deviceValue.ts b/interface/src/project/deviceValue.ts
index 0c1088349..825269c8c 100644
--- a/interface/src/project/deviceValue.ts
+++ b/interface/src/project/deviceValue.ts
@@ -76,10 +76,3 @@ export const formatValueNoUOM = (value: any, uom: number) => {
       return value;
   }
 };
-
-export function isNumberUOM(uom: number) {
-  if (uom === DeviceValueUOM.NONE) {
-    return false;
-  }
-  return true;
-}
diff --git a/interface/src/project/types.ts b/interface/src/project/types.ts
index af7e86bd9..8397e5d1f 100644
--- a/interface/src/project/types.ts
+++ b/interface/src/project/types.ts
@@ -128,9 +128,9 @@ export interface DeviceValue {
   c?: string; // command, optional
   l?: string[]; // list, optional
   h?: string; // help text, optional
-  s?: string; // steps for up/down, optional
-  m?: string; // min, optional
-  x?: string; // max, optional
+  s?: number; // steps for up/down, optional
+  m?: number; // min, optional
+  x?: number; // max, optional
 }
 
 export interface DeviceData {
diff --git a/interface/src/project/validators.ts b/interface/src/project/validators.ts
index d9b65bf8a..de3ae8ee3 100644
--- a/interface/src/project/validators.ts
+++ b/interface/src/project/validators.ts
@@ -1,5 +1,6 @@
 import Schema from 'async-validator';
-import type { AnalogSensor, Settings } from './types';
+import { DeviceValueUOM } from './types';
+import type { AnalogSensor, DeviceValue, Settings } from './types';
 import type { InternalRuleItem } from 'async-validator';
 import { IP_OR_HOSTNAME_VALIDATOR } from 'validators/shared';
 
@@ -162,16 +163,20 @@ export const analogSensorItemValidation = (sensors: AnalogSensor[], creating: bo
     ]
   });
 
-export const deviceValueItemValidation = (isNumber: boolean) =>
+export const deviceValueItemValidation = (dv: DeviceValue) =>
   new Schema({
     v: [
       { required: true, message: 'Value is required' },
       {
         validator(rule: InternalRuleItem, value: string, callback: (error?: string) => void) {
-          if (isNumber && isNaN(+value)) {
-            callback('Not a valid number');
+          if (dv.u !== DeviceValueUOM.NONE && isNaN(+value)) {
+            // not a number
+            dv.m && dv.x ? callback('Must be a number between ' + dv.m + ' and ' + dv.x) : callback('Must be a number');
           }
-          callback();
+          // is a number
+          (dv.m && Number(value) < dv.m) || (dv.x && Number(value) > dv.x)
+            ? callback('Must be between ' + dv.m + ' and ' + dv.x)
+            : callback();
         }
       }
     ]
diff --git a/mock-api/server.js b/mock-api/server.js
index 6a94db470..f18627608 100644
--- a/mock-api/server.js
+++ b/mock-api/server.js
@@ -474,10 +474,12 @@ const emsesp_devicedata_1 = {
       id: '00date/time'
     },
     {
-      v: 18,
+      v: 18.2,
       u: 1,
-      id: '00hc1 selected room temperature',
-      c: 'hc1/seltemp'
+      id: '00Chosen Room Temperature',
+      c: 'hc1/seltemp',
+      m: 5,
+      x: 52
     },
     {
       v: 22.6,
@@ -693,7 +695,7 @@ const emsesp_deviceentities_1 = [
   },
   {
     v: 18.2,
-    n: 'hc1 selected room temperature',
+    n: 'Chosen Room Temperature',
     id: 'hc1/seltemp',
     m: 0,
     mi: 5,