Delmhorst Instrument RC-1E - Manual (Page 6)

6
CARE FOR YOUR METER
Ø Store your meter in a clean, dry place.
Ø Change the 9-Volt battery as needed. Continued use with low batteries may
cause the meter to go out of calibration.
Ø Change contact pins on probe as needed. Keep pin retainers hand tightened.
Ø Clean the probes with any biodegradable cleaner. Use the cleaner sparingly
and on external parts only. DO NOT IMMERSE THE METER OR ANY
ELECTRODE IN WATER.
Ø Remove the batteries if the meter will not be used for one month or longer.