Evolving Lead Puffer Fish
Join Date: Jan 2017
I bought 5 of these for < $1.5 each off of aliexpress. They work fine. The doofis shipped them loose in the boxes and the batteries were inserted and running, and it took nearly 3 mo. to get here (Canada Customs hold packages from Asia FOREVER). So at least I know the batteries should last that long.
On a 75% salt test they ran from 74% to 78% and on a 33% salt test they ran 34%-36%, so they are pretty accurate. They can't be adjusted, but I don't care much. They are labelled and I know which is which.
If you buy something cheap like this, don't bother with a calibration kit. Unless you like farting around I think they are a waste of money. Especially if you embark on tupperdor, get a new 65% boveda pack calibrate using that. They are +/- 2% which is good enough. I'm told you should use a new one.
If you were to take the hygrometers out of the humidor and let them adjust and put them back they may not read more accurately than 2% anyway, and again, that is good enough.
If you want a better hygro, by all means, but if you want to check several tupperdors, then these might be a good way to go. Buy a couple of extras. Put two in each tupperdor. One close to the top, one close to the bottom, see if there is a difference you might have to deal with.