Solarmeter 6.2R UVB RadiometerFind out just how well your UV lamps are operating with this simple to use UVB Radiometer Helps identify whether or not your bulbs need changing Easy read LCD display Durable compact construction Accurate readouts Why Use A Radiometer Providing the correct level of UVB light to your pet is essential to help them maintain a healthy bone structure. However, us humans can't see UVB, so whilst your bulb may still be emitting visible light and looking nice