ON/OFF - Switch on/off: Trigger once to turn on the power, trigger 2 seconds to turn off the power.
- After power on, trigger once to turn off the alarm tone, trigger again to turn on the alarm tone (power on default to turn on the alarm tone).
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SEL - Unit switching
- Press the "SEL" button to toggle through the mG/pT/ (V/M) units.
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Hold Data/℃/℉ - Hold Data/Temperature Units
- Pressing the key for less than or equal to 1 second turns the data hold state on or off;
- Pressing the key for more than 2 seconds switches the temperature unit ℃/℉.
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MAX/BL - Maximum / Backlight (Rear Illumination)
- Press the key for less than or equal to 1 second to turn on or off the maximum value function;
- Press the key for more than 2 seconds to turn on or off the background light and lighting.
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