Amprobe IR-712 IR-720 IR-730 Infrared-Thermometers - Manual (Page 17)

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Caution!
Do not submerge the unit in water.
TROUBLE SHOOTING
Code Problem Action
OL Target temperature is over range Select target within specifications
-OL Target temperature is under range Select target within specifications
Battery indication Low battery Check and/or replace battery
Blank display Possible dead battery Check and/or replace battery
Laser does not work
1. Low or dead battery
2. Ambient temperature above 40°C (104°F)
1. Replace battery
2. Use in area with lower ambient
temperature
BATTERY REPLACEMENT
To install or change one 9V battery (see below):
1. Push the button and pull the handle downward to open battery cover.
2. Install the battery noting its correct polarity.
3. Re-install the battery cover.
Battery: 9V 6F22 alkaline battery or equivalent