Product review (4 stars): For temperatures and min/max use these are fine.
I ordered about a dozen of these. The temperature accuracy was checked against a calibrated reference thermometer. Accuracy was as claimed....within 1 degree centigrade. All units passed. The humidity readings, however, do not appear accurate with up to a 30% difference between them. If you need accurate humidity readings then buy a higher quality humidity meter. For temperatures and min/max use these are fine.