Advanced SensorThis meter is equipped with advanced UV photosensitive devices without stray light, comes with an integrated UVC filter, and has good cutoff characteristics. LED DisplayThe instrument is featured by a clear LCD display, which can show you the UVC testing data of all types of reptile lamps you want. Easy to UseSimply press and hold the push-button switch on the face of the unit. Aim the sensor window in the top panel of the meter directly at the UV source. Note reading on LCD and record if desired. Take several tests at the same distance and averaging, and you will get more accurate data. Perfect ProtectionThis product encloses a rubber case to protect the instrument well from being broken. Long-lasting & PortableThis product uses 2 DC batteries with large capacity which has a long standby time. In addition, the meter is small in size, so you take it with you where you go.