I spent about 2-3 hours messing with the
Apera PH20 today (yesterday at this point) had a bit of problem calibrating the 4.0 point never having done it before & the instructions being sparse. Is it normal for the pH to bounce around a bit when out of water rather than snapping back to zero.
Measurements seemed ok
Distilled Water: 6:00
Tap (only filtered with carbon sediment filter): 9:00
Berkey Filtered tap: 8:00 (kinda surprising I thought it would be the same as tap)
Basement humidifier water: 4:80
Tap water in my part of Ohio (& probably most places) is pretty lime heavy so the results seem pretty acurate to me & are not that surprising.