We bought this thermometer for use in a 40 gallon aquarium for a small teju. It can measure temperature in C and F and humidity in percent. You can either stick it to the glass with the included stick or attach it with a plastic hook. It's fairly accurate, but since it doesn't have probes it can only measure right around the device, which isn't as useful for measuring substrate or bathing areas in the middle of the cage. But it's cheap enough that you can buy multiple units to measure different areas in a larger setup.
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