Product review (4 stars): Terrific for $. Good for showing changes, but not accurate measurements.
It's cheap, colorful, and easy to read.
More accurate-ish than accurate.

Useful for charting humidity & temperature CHANGE  between environments/conditions, or teaching how to read measurement dials. If buying these for classroom use, expect them to have a wide range of readings amongst them all under identical conditions.

If left on its back, the needles end up at the far right of their scales. Righted, it very quickly moves toward the correct-ish measurement.

Like others, I didn't notice when purchasing that the temperature dial is Celsius only. I have it next to an accurate hygrometer, so I'm casually learning the F/C correlation. Also, getting the foot on properly requires fine motor dexterity and is too frustrating/difficult for younger children.

At this moment, it reads 71% vs. 63% RH on the AcuRite 00613A1; 28C vs. 23C.