Bought four at one time.  Three for here in the house, and one for our climate controlled storage unit.  Placed the four humidity meters/thermometers on a table side by side.  Then I sat a contractor grade humidity meter/thermometer (that I had borrowed from an air conditioning contractor) next to the four I bought from Amazon.  I watched them all at intervals for two or three days during the present A/C season.  Temperature wise, the four AcuRite devices were all right on the money and agreed with the contractor grade device.  On the humidity side, the AcuRite devices were within plus or minus one percent of the contractor grade humidity meter.

For my purposes, this is "right on the money.".  Glad I bought them.
Bought four at one time. Three for here in the house, and one for our climate controlled storage unit. Placed the four humidity meters/thermometers on a table side by side. Then I sat a contractor grade humidity meter/thermometer (that I had borrowed from an air conditioning contractor) next to the four I bought from Amazon. I watched them all at intervals for two or three days during the present A/C season. Temperature wise, the four AcuRite devices were all right on the money and agreed with the contractor grade device. On the humidity side, the AcuRite devices were within plus or minus one percent of the contractor grade humidity meter. For my purposes, this is "right on the money. ". Glad I bought them.