- Thread starter
- #81
to late @Jon, i tried those cheap ones & just didn't work well for me so i got the 4-1 vivosun & liked it but can't easily find the cal solution in the city ( my fault for waiting till the last minute ) so bought one a single calibration solution one which will be much easierYou guys….if you can access the Zon, don’t make it so complicated. I buy these three at a time. $9 each. Each has the calibration powders and clear instructions as well as an extra set of batteries. Not once have I ever calibrated one. It’s always accurate as hell. You see my plants - ph issues is one thing I never have. The one I’m using now has lasted 7 months. It’s the best cheap one out there imo.