Facom 720.T Instruction Manual page 33

General Maintenance
To avoid injury or damage to the meter, don't wet the
inner parts of the meter. Before opening the case or
battery cover, remove the connecting cable between
the test probe and the input signal.
Regularly clean the meter case with damp cloth and a small
amount of detergent. Do not use abrasives or chemical
solvents. If the input jack becomes dirty or wet, it may
affect the measurement readings.
To clean input socket:
1. Turn off the meter and pull out all the test probes from
the input jack.
2. Remove all dirt from the jacks.
3. Apply detergent or lubricant to a new cotton ball.
4. Clean each jack with a cotton ball and lubricant to
prevent contamination by moisture in the socket.
Replacing The Batteries
To avoid electric shock, make sure that the test
leads have been clearly move away from the circuit
under measurement before opening the battery
cover of the meter.
Do not mix old and new batteries. Do not mix alkaline,
standard (carbon-zinc), or rechargeable (ni-cad,
ni-mh, etc) batteries.
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