Martel Electronics LC-110/H - Manual (Page 47)

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7. Maintenance
7.1 Replacing Batteries
Replace batteries as soon as the battery indicator turns on to avoid
false measurement. If the batteries discharge too deeply the LC-110
will automatically shut down to avoid battery leakage.
Note: Use only AAA size alkaline, lithium batteries, or rechargeable
NiMh cells.
7.2 Cleaning the Unit
Warning
To avoid personal injury or damage to the calibrator, use only the
specified replacement parts and do not allow water into the case.
Caution
To avoid damaging the plastic lens and case, do not use solvents or
abrasive cleaners. Clean the calibrator with a soft cloth dampened
with water or water and mild soap.
7.3 Fuse Protection
The LC-110 Series is protected with an internal polyfuse against
overcurrent conditions. The fuse will automatically reset, usually
within a few seconds. Do not attempt to open the unit and
troubleshoot. This will void the product warranty.