Review on 🌡️ 4 Piece Indoor Thermometer Hygrometer: Temperature Humidity Meter for Home, Patio, Planting Room, Reptile Terrariums - Mini Black Gauge by Christopher Cortez

Price is good but of the four thermometers I received the temperature shown ranged from 61 to 70. Range of almost 10 degrees! There are two small flat screws on the back for adjusting the display. One for temperature and one for humidity. You need an ACCURATE thermometer (probably an old fashioned red liquid or mercury thermometer) to calibrate all four at once so they are more accurate. Before calibrating, make sure the thermometers adjust to the room settings, then move them to a much colder place and let them sit for 30 minutes and see if they all read the same temperature. Adjust again if necessary.