Oh shit good look venom the MW802 eh? I may have to get that. Been using my sm802 for years never had to recalibrate it yet. Sometimes it can be a .01 off at most but I use soiless and amendments to keep ph solid anyway so not trippin.
Bluelab was my first choice but it was fucked after 3 months of use the readings were super inconsistent. I had two glasses of same water and filled them to the same height and would get different readings lol. I know a chemist who works for the college and they use milwaukees which is why I went from bluelabs to mils. Would never go back. I'm gonna go check the MW802 out right now. LOL Damn you I just bought one, I let you know in a few months the deal. I'm sure i'll be happy with it. About to sell the sm802 when I get it my luck the Mw802 will fail.