
Works well. Accuracy is within approximately 2% relative humidity compared to an atmosphere of known relative humidity. The device is very sensitive and changes quickly even if you breathe too close to the sensor. The instrument appears to have been modified from the original 971. The newer 971 doesn't have a touch shutter. In a way, this change is better because if you forget to pop the shutter, you'll still get a reading, but there's little chance that reading is right. I keep my 971 rolled up in a small plastic bag to protect the sensor. The device is supplied with batteries installed. Batteries appear to be of good quality. Overall, this device is more than reliable enough for HVAC applications.

200-Count Disposable Coffee Filters With Lid For Keurig 2.0 & 1.0 Compatible Reusable Single Serve Pods - White
28 Review

Universal Dryer Thermal Cut-Off Kit With Thermistor And Fuse Replacement - Compatible With Kenmore, Samsung, Whirlpool, KitchenAid And More
24 Review

Room temperature and humidity sensor Aqara Temperature and Humidity Sensor white CN
26 Review

Keep Your Refrigerator Fresh With ICEPURE RPWF Water Filter - 4 Pack Replacement For GE RPWF, RWF1063 And More
32 Review

๐ Wireless and Rechargeable Ontel Arctic Air Freedom Portable Personal Air Cooler and Personal 3-Speed Neck Fan - Lightweight Hands-Free Design
5 Review

iRhodesy Central Air Conditioner Cover: Waterproof & Windproof, Durable Fabric, Fits 36 x 36 x 39 Inches, with Storage Bag
3 Review

Premium Central Air Conditioner Cover - 36 x 36 - Top Universal Outdoor AC Cover Defender - Modern Wave Design (Mesh, 36x36)
6 Review

AnyAir Window AC Season Protection - Set of 2 Foam Insulating Panels, Black
6 Review