The SP120 operates using ambient light - natural, fluorescent and incandescent. When ambient light is not strong enough to power the meter, the 1.5 volt battery automatically turns the unit on. Dimensions: 2.75" X 2.75" X 0.75".
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¥ Solar power with 1.5v battery (1) A76 back-up
¥ 1.875x0.625"/4.75x1.58cm LCD
¥ 10 ft/254cm lead
¥ 30 Second Response Time
¥ 1 Year warranty
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