Use fine sensor, no stray light effect. Simple to use: open the front protection buckle, just need to the luminaire at a certain distance, press the button to the UVB radiation value. Comes with a rubber casing, more suitable for instrument protection. LCD display, high accuracy, small measurement error. Widely used for daily UVB testing of all types of reptile , effectively helping you the and distance of your own bulb. Specifications: material: plastic Probe material: UV glass Color: green Response spectrum: 280-320nm spectrum: p=300nm Measuring range: 0-1999uw / c Resolution: 1uw / c Response time: less than 0.5S Measurement accuracy: 10% Battery: 2 x AA battery (not included) Overall power consumption: less than 0.25W Screen size: 2 inches Packing List: 1 x UVB Meter Only the above content, other are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.