Use fine quality sensor, no stray light effect. Simple to use: open the front protection buckle, just need to align the luminaire at a certain distance, press the button to get the UVB radiation value. Comes with a rubber casing, more suitable for inst ent 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. Material: ABS colour: orange+green Package Contents: 1 x UVB Meter(2 x AA batteries not included) Only the above package content, other products are not included. Note: Light shooting 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.