Boveda Calibration Kit Accuracy


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So I got a Boveda calibration kit and I put the same hygrometer in it twice and after 24 hours the the results were different by about 2%. The temperature was about the same as well so I'm not sure if thats what was causing the difference. I know boveda claims they are accurate to about .5% but just how true is that?

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I find the Boveda calibration kit can "wander" +/- 1%. It probably isn't going to be quite as accurate as the salt test, but provided the hygrometer is of good quality I find it accurate enough for my purposes. And you need to make sure the temp is consistent as @Tdm_86 said. 

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4 minutes ago, Tdm_86 said:

What kind of hygrometer were you calibrating? I have found the Boveda kits to be very accurate, but it’s paramount that the temperature is steady at 20°C for the entire 24hrs.

I'm using a SensorPush so I don't think its that. The temp this time was slightly more consistent this time sitting around 19.5C the whole time as opposed to swinging between 17 and 18 last time

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42 minutes ago, Tdm_86 said:

What kind of hygrometer were you calibrating? I have found the Boveda kits to be very accurate, but it’s paramount that the temperature is steady at 20°C for the entire 24hrs.

I had the same experience.

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It didn't work for me. I had to use manual calibration. There was 4% between boveda 65% and butler. Between 69% and butler was 2% so I did manual calibration and now it looks fine.

Tbh I wouldn't buy Boveda Butler again.

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4 hours ago, SKUZZ said:

I'm using a SensorPush so I don't think its that. The temp this time was slightly more consistent this time sitting around 19.5C the whole time as opposed to swinging between 17 and 18 last time

I think that is exactly your problem. The stated accuracy of SensorPush at 25C is plus minus 3% "typically" and can be up to 4.5%. 

Our hygrometers are not some sceintific specialised equipment. It's definitely not going to be accurate with a one point calibration. It's there for a "guide", nothing more.

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After a year of having mine it started being super inaccurate. Even after calibrating multiple times. They eventually replaced it after a month of back and forth emails. 

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As @LordAnubis has already mentioned the SensorPush is advertised to have an accuracy of ±3% typical ±4.5% maximum @ 25°C / 77°F, from 20% - 80% RH. Boveda packs are advertised to be accurate within ±1%. So if you're using the 75% RH and a SensorPush, the hygrometer can read anywhere between 69.5% and 80.5% and still be "accurate" per the manufacturer's specs.

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