Tropical moisture meter (hygrometer)

My wife purchased this object from a garden supply centre. The instructions are lean on information but it looks like one of those meat thermometers you stick in the meat to see if it is rare, medium or well done.
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The sensor shaft appears to be stainless steel and is seamless. Can anyone tell me about it? Can it be used outside? Is it accurate?
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Moisture meters can be used inside and outside. More appropriate for inside use since it/s not easy to get your finger deep into the soil to assess moisture near the bottom of the pot. Judicious use of the meter will prevent your housepolants from getting root rot.
For your outside plants, all you need to do is scratch two or three inches into the soil with your finger to feel if it/s dry. No need to worry about root rot unles your garden site drains poorly.
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They are often inaccurate.
David
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