Model 61-686 measures incandescent, fluorescent, metal halide, high-pressure sodium and halogen lamp output. To use, place meter’s remote sensor in area to be measured, press "on" button and light level will appear on LCD read-out. Values can be saved on LCD by pressing Data Hold button or Max Hold button to capture maximum value. Remote sensor has 1.5 meter cable for hard-to-reach areas. Compact meter slips into pocket or provided tool tote when not in use. Shipped with standard 9V battery. MSRP is $139.