Features:
- Use for monitoring terrarium humidity levels. Easy to read and install
Editorial Review:
The Exo-Terra Hygrometer monitors terrarium humidity levels. It is easy to read and install. The Hygrometer reads levels for dry, moderate, and humid (0% to 100%) humidity.
Customer Reviews:
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Avg. Customer Rating: 2.5 / 5.0 
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An Inexpesive Hygrometer for Practical Purposes 
I am using three of these small (4 centimetres in diameter), inexpensive hygrometers to measure humidity in closets. I have checked their accuracy with a more expensive hygrometer, and they seem to be registering reasonable values. The scale of relative humidity between 0 and 100 per cent is marked in 1 per cent intervals, which are quite small, but it is relatively easy to read by 5 and 10 per cent intervals. The scale is also colored from red (dry) through orange, yellow, green, blue, and violet... more info
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Uncalibrated 
I bought a set of 5 of these; each one gives a different reading, even if I leave them next to each other for hours.
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a seriously inaccurate measuring instrument 
this hygrometer when placed beside two other hygrometers of different manufacture and of known accuracy, proved to be consistently off in its measurment by 20%. After disassembling and recalibrating it, it improved to 10% off of actual values, but then was no longer consistent in the degree of error. In other words, get back to the drawing board you designers of this mistake!
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