Size:10-Pack This is a cobalt chloride free color-change reversible humidity indicator card that has 6 indicating spots 10/20/30/40/50/60-percent rh, they change from brown dry to pale green humid. This card complies with mil-1-8835. A great tool to assist you in keeping your valuables protected.
M**E
Clearly showed whether my desiccant packets were working.
These worked great. I was staying in Hawaii and put these inside things like the box for my sewing machine, along with desiccant packets. I also left one out as a control. The one I left out showed about 90% humidity and the one in with the sewing machine showed about 30% humidity.
I**I
they work, but it's not clear how to read them
Well, this is working, but as others said it is a little difficult to understand how to read them; all the spots turned to a pale green colour, which is "more green" than 10% spot: does anyone know how to read them? in the pictures below, you can see the strips before use and while in use.
B**3
Harder to read
The cobalt-free technology humidity indicator spots, which change to various shades of brown/grey, are harder for me to read than the cobalt based humidity indicators that change color from blue to pink.
R**R
They work, a little difficult to distinguish color
They work, but not the easiest to read. It doesn't "turn" green, but rather brown to a "brownish green" to green. Kind of of a judgement call how brownish green is too green.
Trustpilot
2 weeks ago
4 days ago
