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Wolf Thermometers come in four different styles to choose from. The Dial and Glass Thermometers have the ability to float in the developing tank. The Stainless Steel Thermometer hooks onto the side of the developing tank and the Digital Thermometer is simply placed in the developing tank and with a press of a button the temperature is display.

The Wolf 18903 Dial Thermometer is calibrated from 0 - 140 degree F, made of stainless steel, and comes with a cup for floating in the tank.

The Wolf 18904 Glass Thermometer floats in the developing tank. The Glass Thermometer is calibrated from 0 - 100 degrees F.

The Wolf 18905 Stainless Steel Thermometer features a stainless steel shell and hook for hanging on the tank. The Wolf Stainless Steel thermometer is calibrated for accuracy between 20 and 150 degrees fahrenheit

The Wolf 19107 Digital Thermometer includes a standard watch battery and comes with a lifetime warranty. The Wolf Digital Thermometer registers temperatures from negative 40 to 300 degrees F. Simply place the Wolf 19107 Digital Thermometer in the developing solution and press the button. Temperature is digitally displayed on a LCD.