Dropastone
Well-Known Member
Hmm, I got the same model as you and I calibrate mine once a month and it's never off by more than a tenth of a point. I'm not trying to knock your drops and I'm sure they are very accurate but it seems to me that it would pretty hard to match the same color every time. For example do you know how many different shades of orange there is? Trying to match that shade every time would be almost impossible and I'm sure your results will vary from test to test. IMO the drops are more like a ball park figure.i calibrated it with drops last time i used it, so it matched what the color was from the drops. and now its reading at least 2 whole points off. from what ive read the drops dont go bad, and they seemed to work good when i wasn't using a dig meter for my water farm. im going to wait till i can afford calibration and storage fluids for it. it's a $25 milwalkie ph 600 off amazon or ebay.
I'm only trying to help my friend.
Peace.