Fixed Issue 82.

Hardware/ISensor.cs

@@ -72,7 +72,10 @@ namespace OpenHardwareMonitor.Hardware {
 
     float? Value { get; }
     float? Min { get; }
-    float? Max { get; }    
+    float? Max { get; }
+
+    void ResetMin();
+    void ResetMax();
 
     IEnumerable<ISensorEntry> Plot { get; }
   }

Hardware/Sensor.cs

@@ -163,6 +163,14 @@ namespace OpenHardwareMonitor.Hardware {
     public float? Min { get { return min; } }
     public float? Max { get { return max; } }
 
+    public void ResetMin() {
+      min = null;
+    }
+
+    public void ResetMax() {
+      max = null;
+    }
+
     public IEnumerable<ISensorEntry> Plot {
       get { return entries; }
     }