diff --git a/tools/2m_scan.bat b/tools/2m_scan.bat
index 43f3d5c..8e0db3c 100644
--- a/tools/2m_scan.bat
+++ b/tools/2m_scan.bat
@@ -1,5 +1,5 @@
 @echo off
 
-C:\Python27\python.exe meas.py -o 2m.csv -s 144000000 -e 146100000 -i 1 -p 5000 -d COM16 -m
+C:\Python27\python.exe meas.py -o 2m.csv -s 144000000 -e 146100000 -i 1 -p 5000 -d COM16 -m -g
 
 pause
diff --git a/tools/meas.py b/tools/meas.py
index 619adb6..9516aaf 100644
--- a/tools/meas.py
+++ b/tools/meas.py
@@ -528,8 +528,8 @@ if __name__ == "__main__":
                 min_vswr[0] = vswr
                 min_vswr[1] = m[0] # the frequency
 
-              # R = meas_data[0] * 5V / 1023 * I
-              r = 50.0 * vswr # (m[1] * 5.0 / 1023.0) / i
+              # impedance
+              r = 50.0 * vswr
               meas_r.append(r)
 
               # P = meas_data[0] * 5V ^ 2 / r
@@ -549,9 +549,11 @@ if __name__ == "__main__":
             print "Output file " + args.output_file + " written."
 
           if args.show_graph == True:
-            plt.plot(meas_freq, meas_ratio)
-            plt.plot(meas_freq, meas_r)
-            plt.plot(meas_freq, meas_p)
+            lv, = plt.plot(meas_freq, meas_ratio, label='VSWR')
+            lr, = plt.plot(meas_freq, meas_r, label='Impedance')
+            lw, = plt.plot(meas_freq, meas_p, label='Watt')
+
+            plt.legend(handles=[lv, lr, lw])
 
             print "Please close the mathplot window to exit..."
             plt.show()