Review on 🌡 Veanic 4-Pack Mini Digital Thermometer Hygrometer Meters Gauge - Large Number Display, Fahrenheit Temperature (℉), Humidity for Home, Office, Humidors, Jars, Incubators, Guitar Cases by Greg Mahoney

Of the 4 bags, all temperatures were exactly the same but the hygrometer readings were off by 3%. While not bad, I was expecting something more consistent. What surprised me was that batteries were installed and working on all 4 sensors. How long are the batteries in? This makes the batteries run a little less than if I had it enabled. What I was expecting was a retractable pull tab that would allow the batteries to power the device as needed since I don't need all 4 at once.