: 1(DC).
Tip to Ground Potential: 25mV(True RMS).
Quick operation:
1. Short press SET button once to switch ℃/F display.
2. Long press SET (lock/unlock) to set the storage channel.
3. When the power is off, press and hold the SET key for abou 3 seconds to automatically enter the temperature calibration interface, press the up and down keys to adjust the temperature, after the adjustment is completed, press the SET key to save and exit.
4. Button state, press and hold the CH1 button for abou 3