Zoo Med Repti Temp Rheostat; Turn up the heat — or not — with the Repti Temp Rheostat from Zoo Med! With a simple twist of a knob, you can easily adjust the temperature of two compatible heating sources with a combined wattage of up to 150 watts. Pair this convenient device with non-thermostatically controlled heating devices like rock heaters, heat caves or overhead incandescent bulbs (sold separately), and crank them up, or turn them down depending on the season. Knob controls are easy to turn and change temperature. Easily manually control 2 different heating devices (sold separately). 2 heat sources feature a combined wattage of up to 150 watts. Ideal for non-thermostatically controlled heat devices. Great for constantly changing ambient room temperatures.