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

After buying a few slightly cheaper gauges I finally broke down and bought this one. The next step in my lab will be to buy a device with an external electrode, but I've heard good things about it. As people have said, you should have a storage solution and keep the sponge and head wet all the time. I calibrate regularly with liquid and it has held up for over a year. I know this won't last forever and after my issues with my latest pH meters I have a spare handy if needed, but it's very easy to use, easy to calibrate and accurate.