Set of 6 thermo-hygrometers. These are easy-to-read digital thermo-hygrometers that can be installed on the left and right sides and the back of the case. They can be easily attached to glass surfaces with suction cups. Power/Voltage: Button battery (LR1130) / 1.5V Temperature Measurement Range: -10∼50°C (14∼122°F) Humidity Measurement Range: 20%∼90% Measurement Cycle: 20 seconds (Accuracy +/- 1°C, +/- 5%) All units have been tested and confirmed to be working. Batteries will be removed before shipping. Please assess the condition based on the photos. These are used items. Please purchase only if you understand and agree to this. If you have any questions, please comment before purchasing. No price reduction. No individual sales. Instant purchase is welcome.