Use quality 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 get 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 lamps, effectively helping you choose the best angle 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: T less than equal 0.5S Measurement accuracy: 10% Battery: 2 x AA battery (not included) Overall consumption: less than equal 0.25W Screen size: 2 inches Packing List: 1 x UVB Meter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.