This is a 4 IN 1 Multi Test Meter AOK，For ESC Tester; Servo Tester; PPM singal Tester; Temperature Gauge.   
Note: Be sure to use with the AOK-BL8S product portfolio, this product can not be used independently.
1.Performance testing of ESC.
2.Servo rotation direction and scope of testing.
   Servo sensitivity of each cell of the test (0.01ms).
   Automatic operation or manual operation test of the choice of servo.
   Receiver signal is out of control monitoring alarm (out of control looking for).
3.Digital temprature measurement and over-temperature alam (adjustable temperature alarm value).
   0.36 in. red high brightness LED digital display.
4.Input and output ports are equipped with anti-reverse polarity protection circuit.