Prokit's Industries MT-4014 - Manual (Page 7)

current value of temperature and humidity. The default
humidity / temperature unit is % RH / ℃.
2. Press Unit key to change the humidity / temperature
unit. The adjustable parameters are %RH(relative humidity),
td(Dew-point temperature),
℃, ℉
; press the Mode and
H
Li
OLD
ght
key to change MAX/MIN and HOLD mode.
3. Switching the back light on
When the meter is power on, press key >2sec.
the back light will be turned on, and the icon will
display on the LCD. Press the key once >2sec. the light
will be turned off, and the icon will disappeared.
HOLD
Light
If you still need more operations, please see the
description of function keys.