Official Luthiers Forum!

Can't remember. Just buy a good thermometer and use a vacuum cleaner to pull air across the bulb. Then wrap the bulb with a bit of damp/wet cloth and do the same. There should be some tables online that help you work out the RH. I've dismantled my sling and I'm using one of the thermometers from it. I only use it once per year to check that my Hygrometers haven't gone too far out.

Nice one Murray, even nicer Mario.
So simple and inexpensive.
Gives me a cross-check with my saturated Potassium Carbonate.

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The name catgut is confusing. There are two explanations for the mix up.

Catgut is an abbreviation of the word cattle gut. Gut strings are made from sheep or goat intestines, in the past even from horse, mule or donkey intestines.

Otherwise it could be from the word kitgut or kitstring. Kit meant fiddle, not kitten.

got my 3 from stew mac. two were 1% apart and the third was 3%--4% from them.not to bad I guess.there was no paper work at all,just in little boxes.I like the big dials.cheers,Donny

I picked up a dial type from an online weather related store.It was pricey. Over the years I used digital hygrometers and was never sure of their readings. Battery's would weaken and readings would be all over the place. Even with good batteries it seamed that the readings would be jumpy and non consistent I would even get two different readings if i put both of them in the same place in the shop...Mike

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Another day, another dollar.