Optical  power meter features:

           ►  3 1/2 Digits of Dynamic Range
►  Wavelength 633,670,850nm
►  The Liquid Crystal Display
►  Power Range:2nW to 16mW
►  Offset Adjustment of Zero Point
►  Powered by 9V Battery
►  Low Cost
►  Other Wavelength are Available

Optical power meter Specifications:

Model	19OPM-20
Detector	Silicon photodiode
Wavelength	635,650,670nm (others available)
Maximum power density	lmW/mm
Maximum power	20mW
Power ranges	20nW to 20 mW full scale
Response time	100m sec
Offset function	Manual offset adjustment of zero point
Measurement accuracy	±5% (632.8nm)
Display	Liquid crystal display
Display dynamic range	3 ½ digits (include battery low indicate)
Power supply	9V battery (more then 40 hours)
Operating conditions	10 to 40 XC
Detector active	5.8mmX5.8mm
Dimensions	175*86*35 (mm)
Other visible wavelength are available upon request

 
Also works for Laser power meter and power meter