The Series GBT Glow-in-the-Dark Bimetal Thermometeroffers accurate and reliable measurements, even in dimly-lit areas. The bimetal element directly drives the pointer, eliminating gears and linkages. The scale background glows brightly when mounted in dark areas for ease of reading. The glass lens can easily be cleaned and resists scratches for better viewing of the scale. Series GBT thermometers can be ordered in various stem lengths, connections, and ranges to fit most applications.