Usage Tips:TWO IN ONE: The mini digital hygrometer thermometer with built-in probe, electronic thermometer and hygrometer for measuring temperature and humidity for indoor use.WIDE TESTING RANGE: Humidity meters measuring range: -58-158 , humidity measuring range: 10%-99%RH.HIGH PRECISION DISPLAY: Humidity Meter measurement accuracy: 2, humidity measurement accuracy: 5%RH.EASY TO INSTALL: Our humidity meters gauge can help you to konw the current temperature and humidity, embedded opening size (1.81x1.06 inch) . If the size is not suitable, it can be fixed with double-sided tape.WIDELY USED: The indoor thermometer hygrometer widely use in greenhouse, garden, guitar case, incubators, brooders, office, cellar, fridge, closet any other place that requires monitoring of temperature and humidity levels.Colour:blackMaterial:ABSSize:about 48 x 28.5 x 15.6mmPackage Contents:6 x Digital ThermometersOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.