Interesting point about mercury thermometers not being reliable on their sides. I'll have to stand mine up and check. Using a lab grade mercury and digital aquarium thermometers. The hygrometer thermometers shouldn't be submerged. How to calibrate? Check with medical or lab grade.
The freezer bag hygrometer test showed low at 65%. Was advised to use glass jar. 2 Hygrometers came up to 72/73% within 2 hours. Much better accuracy. Beware the sealable bags.
Check your batteries or have spares. Weak batteries will cause errors on hygrometers and thermometers.
The freezer bag hygrometer test showed low at 65%. Was advised to use glass jar. 2 Hygrometers came up to 72/73% within 2 hours. Much better accuracy. Beware the sealable bags.
Check your batteries or have spares. Weak batteries will cause errors on hygrometers and thermometers.