I've never tried it with the raised side down, just the flat & it always seemed to give quite accurate readings when checked against a mercury thermometer....

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ACR registered breeder #424
My website : http://www.BribrianCorns.tk

I know, probably the dearest around lol, but I wanted it because they record a min and max temperature. So when I come home from work I can check it and see what has happened during the day.

I put it in temporary just to check and yes, my Exo- Terra ones are going in the bin tomorrow. Around 10°F higher reading on the temperature and around 20% humidity LESS.

Based on what I have seen so far in the last hour, I think I will be buying a ceramic heater for the night time. We'll see though.

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Hi,

I bought one of these though they are more expensive than the ones mentioned. Though at the time they were the first to have integrated temperature and humidity from a single probe and therefore not requiring the unit to be placed in the viv.

http://www.dartfrog.co.uk/equipment/termo-hygr.html

Hope this helps,

Jon.

Nice one, been looking for one of those for ages

Hi,

That was my first post after joining the forum so it was glad to be of some help ;-)

I bought it for my sisters snakes and to be honest the build quality isn't brilliant but it does the job. I also didnt have time to do any "salt" callibration on the hygometer itself, but I can say against a standard dial type which was already in the viv the readings were about the same.




Hope this Helps,


Jon.

I love the idea of only having one probe

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JonnyEmm - how do you do the salt calibration?

The only method I know is to put the hygro in a totally sealed tub with a bottle top lid containing damp salt, which should create a steady 75% humidity after several hours.

Tried it twice and the results have been way out - sometimes really low, sometimes really high - the hygros are from RS, £40 or so, so I don't think they can be that inaccurate.

The instructions I have are a bit vague as to the amount of water to put on the salt, so don't know if that's where I've gone wrong - tried it with just a few drops and with a dozen or so but never got anything like a steady 75%.


Any ideas?

Hi,

The "Salt Test" I was refering to was the one you mention. Getting a bottle top of household salt, wetting it (consistency of wet sand) and putting in a sealed container ( I use a sealable freezer bag ). Which as you say should give a 75% humidity reading after around 8 hrs ;-( The amount of water you put on the salt will differ on how much salt your using, but as long at the salt hasnt become a solution in any way and is still chrystalized it should be fine.

You can also as a quicker test simply rap the humidity sensor in a very damp cloth and see what happens. This should obviously yield a very high humidity reading and should come out at 100% after no longer than 45 mins. This way is not as accurate but can usually give a good guide.

I agree with your last comment as well, I wouldnt expect your hygros to be too far out.

Happy Testing

Jon.

Cheers for that - I'll have another go!