I bought one of these off of Amazon. There are a ton of Chinese made versions of this available. I don't know if any are better or worse. I got the single remote sensor version. The screen itself is a sensor and then one remote sensor. It seems fairly accurate. I "calibrated" it with a Boveda cigar humidor hygrometer calibration bag. There is no adjustment on the sensor. Just get a reading for how far off it might be.
However! : The Boveda bag guarantees 75% humidity. The temperature never agreed between the screen and sensor but the remote sensor seems to be accurate for humidity and within half a degree temp at various places around the house. It definitely took more than 24hrs for the sensor to stabilize in the bag but eventually was accurate.
@Boveda - Been a while since I enjoyed a cigar but I remembered your calibration bags. Looking forward to trying your new ventures in cannabis products.
However! : The Boveda bag guarantees 75% humidity. The temperature never agreed between the screen and sensor but the remote sensor seems to be accurate for humidity and within half a degree temp at various places around the house. It definitely took more than 24hrs for the sensor to stabilize in the bag but eventually was accurate.
@Boveda - Been a while since I enjoyed a cigar but I remembered your calibration bags. Looking forward to trying your new ventures in cannabis products.