Prokit's Industries MT-4014 - Manual (Page 8)

■. Function keys
1. ON/OFF key
Press the key to turn the power ON and press the key
once more >2sec. to turn the power OFF.
2. Mode key
Press the key can select the state of MAX、MIN.
LCD will display the max/min values since the
instrument was last switched on or last reset.
3. Unit key
Press the key can change the parameter unit.
Adjustable units: %RH/℃,td/℃,%RH/℉,td/℉.
4. key
HOLD
Light
Press the key, a icon will display on the LCD and the
readout held in. Press the key once more to cancel the
hold function.
Press the key >2sec. the back light will be turned on,
and the icon will display on the LCD. Press the key