This economical meter reads UV or visible light transmission percentage. It can test lenses in or out of frames. It is powered by a standard 9 volt battery, which will last about 40 hours with the display on. Calibrates easily with a single knob, measure visible light with the left button, UV with the right button. It can be calibrated for either 380 or 400nm UV standards. A compensation table for lens power is on the back of the unit. The unit automatically shuts down after either button release.

Length	5.5"
Width	3.25"
Height	3.5"
weight	0.6lb
Electrical	9VDC