Dry & Dry Premium Vochtigheid Indicator Kaarten (12 Kaarten) - 10-60% 6 Spot (Herbruikbaar)

the first oreder 'got lost' but i received a credit and ordered again...but the price had gone up! the spots eem to react to the humidity quite well, but the colour change is not terribly clear, quite suntle really.

I have a host of 3D filament spools and like to store them all in dry storage boxes, some are used infrequently and I'll store unopened spools as well. I bought the cheap $2 humidity sensors but they won't register below 20% and can't be used for really dry environments. These moisture indicating strips are cheaper and more accurate. They are really designed for dry storage measurements. The only downside is they are hard to read and it takes some "practice" to translate the lavender color to moisture value. I initially used a lab grade sensor as a reference and added it to some boxes with a strip to help me understand the color shift. I'm used to seeing the mostly blue dots and can pretty easily tell when the desiccant needs to be recharged. These are much better at monitoring dry storage than the cheapo humidity gages and I highly recommend.

Damn near worthless. The color change is so subtle that it's almost imperceivable to see any change within a 20% change in humidity on this indicator. The digital display has humidity in upper right corner indicating 41% humidity. Do you see any difference in color shades of the dots on the humidity indicator strip? I can barely see a change in the pink shade at 60%, but it's definitely nowhere near blue. The error margin on these humidity indicators is at least 30%, but could be more.

color turns back and forth as long as there's moisture level change.

I like these because they offer a guide as to how my gel packs are doing in my ammo cans where I keep my guns, ammo and valuables. If the 3rd dot from the left gets a hint of discolor I know it's time to throw my gel packs in the oven. I'm not in the dark anymore or wondering how my gel packs are doing. I place them on the top of my stuff in my ammo cans which gives me immediately feedback upon opening the ammo cans.