Review on 🌡️ 2PCS Mini Digital Hygrometer Thermometer: Accurate Indoor Humidity Monitor for Humidors, Greenhouse, Garden & More by Nick Mahoney

I have ordered (2) packs of hygrometers/temp sensors for each of my machines. I decided to test their accuracy on other digital weather sensors I have at home and on each other. I installed 2 near the central weather unit for comparison and let them stabilize for 3 days. I have provided a comparison photo. The difference values to each other are 0.3 degrees Fahrenheit and 2%. The difference of 2%, 40% and 42% is not within the given +/- 2%. The 40% hygrometer reading versus my home weather hygrometer's 39% is within acceptable limits, and apparently 42% has nothing to do with its sibling or weather hygrometer. The temperature on the two siblings compared to the weather sensor is within 3%. I ordered sensors for my cars to analyze my dry cough, which I believe is related to the humidity difference between the outside air and the air inside the house. The price for (2) sensors is very cheap and relatively accurate. The surprise was that two related hygrometers did not match within the specified tolerances. I expected the siblings to be relatively close to the weather station and closer together. I didn't measure the response time and accuracy, except for the 3-day stabilization period. So the 4-star overall rating reflects the 3-star rating for the tolerance deviation of +/- 2% from the advertised tolerance between hygrometers of the same tier. The device gives good general information about temperature and humidity, of course for the price.