Calculated Industries 4095-C User Guide - Manual (Page 58)

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Batteries
The Pipe Trades Pro uses two LR-44 batteries.
Replacing Batteries
Should your calculator display become very dim or erratic,
replace the batteries.
Note: Please use caution when disposing of your old batteries,
as they contain hazardous chemicals.
Replacement batteries are available at most discount or
electronics stores. You may also call Calculated Industries at
1-775-885-4900.
Battery Replacement Instructions
To replace the batteries, slide open the battery door (at top
backside of unit) and replace with new batteries. Make sure the
batteries are facing positive side up.
Reset
If your calculator should ever “lock up”, insert the tip of a
paperclip into the small Reset hole located above the A key –
to perform a total reset.