I use one in every level and one in every wooden viv.
I've got loads of different ones like exo terra, swell reptiles and a few others. I check them all with the salt test and only use the ones that are pretty close.
The worst one I have is an exo terra one that 32% off. It was supposed to show 75% and only got to 43%.
Sorry that that's not what you asked but I thought I'd share lol.
Morel of the story is I don't trust brands only the ones I've tested.
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