It make my life easy to know the time to change some of my tank water for better life and health for my salt water fish.

Thanks fish street

very good procut for its price. Unfortunately the manual is not in English

I recmmend that all tank have PH meter like this .

very good procut for its price, hysteresis could be more accurate (0.1 instead of .15) but still its fine, it changed my life with tank mainteinance with CO2 system installed, must say that needs monthly calibration, nothing hard to do.
as negative point only the calibration screws, mostly the ph co2 control one, are hard to set up in the desired point due to an inaccurate screw.

Very good, but needs calibration every month.