I don't know how good it is but I use.

https://www.amazon.com/API-POND-MASTER-Water-500-Test/dp/B0002DJNN0

and

https://www.amazon.com/dp/B002C0A7ZY?aax...d=8105281260901

and

https://www.amazon.com/dp/B002C0A7ZY?aax...d=8105281260901

POnd master and digital meter always read 1 Ph higher than the test strips. But I use the test strip for alkalinity.


1.8 acre pond with CNBG, RES, HSB, and LMB
Trophy Hunter feeder.