Zoo Med's Precision Analog Gauges are of professional breeder quality, with many features not found in cheap imported gauges. Features include European-made precision German movement, side-venting to prevent against "fogging" inside the thermometer, and Velcro backing enabling you to remove the gauge for terrarium cleaning and maintenance. Liquid crystal thermometer for all types of enclosures. Ranges from 70F to 105F (21C to 40C) with easy to read crystal coloring.