With respect to the RAPT Pill Hydrometer generally speaking it's highly accurate once you do the two point calibration process but this statement has two exceptions:Hi @KegLand-com-au -- I've got the RAPT Pill and fitted the wireless charger. I've recalibrated twice, first a simple and now a two-point, but the readings are way off. The first brew I post-fitting the Pill was 25 points low. The current brew after a two-point calibration is now sitting about 55 points high. Once the current brew is done I'll do another thorough recalibration, but any tips?
1. If you have dried up crap stock on the surface of the pill. Clearly this will effect how it's floating. Also if you dry hop and the pill is sitting in a big crust of dry hops that have floated to the top of the fermenter this will effect results too.
2. The other major thing that can effect accuracy is when you open and close the housing. As you have stated you are using the wireless charger so now that this is the case you should never ever have to open up the pill housing at all. Clearly if you open and close the housing and it's not done up to the same "tightness" or the board or battery is in a different position this can require you to re-calibrate. Sounds like this is not the issue for you as I doubt you would have opened up the case if you are using the wireless charger.