diff --git a/README.md b/README.md
index 40f19c6..8d3fb91 100644
--- a/README.md
+++ b/README.md
@@ -37,8 +37,8 @@ const openEarable = new OpenEarable();
 // Read device information once connected
 openEarable.bleManager.subscribeOnConnected(async () => {
     const deviceId = await openEarable.readDeviceIdentifier();
-    const firmwareVersion = await openEarable.readHardwareVersion();
-    const hardwareVersion = await openEarable.readFirmwareVersion();
+    const firmwareVersion = await openEarable.readFirmwareVersion();
+    const hardwareVersion = await openEarable.readHardwareVersion();
 });
 
 // Connect to OpenEarable
diff --git a/assets/js/ChartManager.js b/assets/js/ChartManager.js
index 1acdb88..dcffb22 100644
--- a/assets/js/ChartManager.js
+++ b/assets/js/ChartManager.js
@@ -220,13 +220,13 @@ function onClearGraphs() {
     chartIds.forEach((chartId) => {
         const chart = charts.find(chart => chart.id === chartId);
         if (chart) {
-            chart.data.labels = [];
-            if (chart.data.datasets) {
-                chart.data.datasets.forEach((dataset) => {
-                    dataset.data = [];
-                });
-            }
-            chart.update();
+            chart.data.labels.length = 0;
+            chart.data.datasets.forEach((dataset) => {
+                dataset.data.length = 0;
+            });
+            chart.options.scales.x.min = 0;
+            chart.options.scales.x.max = 149;
+            setTimeout(() => chart.update(), 0);
         }
     });
 }
diff --git a/assets/js/OpenEarable.js b/assets/js/OpenEarable.js
index 106fa74..390f724 100644
--- a/assets/js/OpenEarable.js
+++ b/assets/js/OpenEarable.js
@@ -64,6 +64,9 @@ const SERVICES = {
             },
             DEVICE_GENERATION_CHARACTERISTIC: {
                 UUID: '45622512-6468-465a-b141-0b9b0f96b468'
+            },
+            HARDWARE_GENERATION_CHARACTERISTIC: {
+                UUID: '45622513-6468-465a-b141-0b9b0f96b468'
             }
         }
     },
@@ -151,10 +154,6 @@ class OpenEarable {
         return new TextDecoder().decode(value);
     }
     
-    async readHardwareVersion() {
-        return "1.3.0";
-    }
-    
     async readFirmwareVersion() {
         this.bleManager.ensureConnected();
         const value = await this.bleManager.readCharacteristic(
@@ -163,6 +162,15 @@ class OpenEarable {
         );
         return new TextDecoder().decode(value);
     }
+
+    async readHardwareVersion() {
+        this.bleManager.ensureConnected();
+        const value = await this.bleManager.readCharacteristic(
+            SERVICES.DEVICE_INFO_SERVICE.UUID,
+            SERVICES.DEVICE_INFO_SERVICE.CHARACTERISTICS.HARDWARE_GENERATION_CHARACTERISTIC.UUID
+        );
+        return new TextDecoder().decode(value);
+    }
     
 
     subscribeBatteryLevelChanged(callback) {