The Loctite 7020 UV Spot Radiometer is a self-contained, electro-optic instrument designed to measure and display the UV power density (irradiance) emitted by a UV spot curing system.  Designed to provide the operator with instant feedback as to the performance of the spot curing system based upon changes in the irradiance. Features: Measure light guide degradation Optimize multi-pole light guide positioning Determine proper intensity required for curing various materials. Meets ISO-9000 requirements Includes adapters for 3 mm, 5 mm, and 8 mm size lightguides Technical Data Range:  0 to 20 Watts per square centimeter Resolution:  10 mw cm2 Display:  3.5 mm digital LCD Display Time: 2.5 to 5 minutes Spectral Range:  320 to 390 nm (UVA region) Power Source:  Lithium Battery Stick Battery Life: 12,500 hours continuous operation (over 100,000 readings) Overall Dimensions:  163 mm long (6.42 inches) x 53.6 mm diameter (2.11 inches) Weight:  12.8 oz. Case Material:  aluminum, polyester, and quartz Includes Calibration Certificate, Instruction Sheet, and Carrying Case. Recommended calibration once every 6 months after unit is put into service.