Calibrating a hygrometer

[Lensman]

@TiggerDad brings up a topic that I've always wondered about, calibration of hygrometers and specifically digital hygrometers:

Me either. My problem is some days I forget to properly calibrate it first.

I wanted to take this discussion out of the Gondola thread lest it drive @The Mom crazy.

So my go-to digital hygrometer for the home is the Accu-Rite 01083M:


I've "calibrated" other hygrometers using the salt (sodium chloride) test and determining an adjustment factor. However, from comparing readings of different hygrometers under identical conditions, I've determined that the adjustment factor isn't a constant across all humidity levels. I've also calibrated these other hygrometers using a 100% saturation test (in the bathroom while taking a shower), as well as using potassium carbonate.

The Accu-Rite model above calibrates to within 1% Rh and is good across different levels.

I don't know what's going on with my other hygrometers.

What have your experiences been? All my friends think I'm crazy for being obsessed with humidity, so I was excited to see that I might have found an expert or at least a fellow aficionado.

 

[TiggerDad]

@GoofGoof @Phil12

 

[GoofGoof]

@TiggerDad brings up a topic that I've always wondered about, calibration of hygrometers and specifically digital hygrometers:


I wanted to take this discussion out of the Gondola thread lest it drive @The Mom crazy.

So my go-to digital hygrometer for the home is the Accu-Rite 01083M:
View attachment 391609

I've "calibrated" other hygrometers using the salt (sodium chloride) test and determining an adjustment factor. However, from comparing readings of different hygrometers under identical conditions, I've determined that the adjustment factor isn't a constant across all humidity levels. I've also calibrated these other hygrometers using a 100% saturation test (in the bathroom while taking a shower), as well as using potassium carbonate.

The Accu-Rite model above calibrates to within 1% Rh and is good across different levels.

I don't know what's going on with my other hygrometers.

What have your experiences been? All my friends think I'm crazy for being obsessed with humidity, so I was excited to see that I might have found an expert or at least a fellow aficionado.

Sorry, I have no actual knowledge of hygrometers, I was just making a stupid joke. I usually just use the weather.com app on my phone or if it’s Florida from May to September I step outside and it’s obvious the humidity is 100%

Actually now that you posted the picture I see it’s a pretty small device that could easily be carried into a theme park. I was picturing @Phil12 setting up something like this in the parking lot: