Review on HM Digital Waterproof pH and Temperature Meter, 3.3 x 8.5 x 2 inches, White by Crystal Montanez

This is a strong and reliable PH grip. Just make sure you store it properly and it should serve you for a long time. I check the calibration sometimes and it keeps the calibration fine. If I had a catch - I have the "matching" PPM/TDS version of this PH meter. The TDS meter has a backlit display. Not this PH pen. I'm not sure what the reasons for this are. And that may seem trivial to many. Maybe that. But having that backlit display is certainly nice. I wish this PH meter had this feature.