Calculated Industries 4090 - Manual (Page 116)

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Auto Shut-Off
Your calculator is designed to shut itself off after about 8-12 Minutes
of non-use.
Battery(ies)
• Two LR44 batteries.
Replacing the Battery(ies)
Should your calculator display become very dim or erratic, replace
the battery(ies).
Note: Please use caution when disposing of your old battery, as it contains hazardous
chemicals.
Replacement batteries are available at most discount or electronics
stores. You may also call Calculated Industries at 1-775-885-4975.
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 Key
If your calculator should ever “lock up,” press Reset — a small hole
located to the left of the
O key — to perform a total reset.