
Good device. Calibration is easy. Calibration powder included. The Tds value starts out low and drifts up over time until it stabilizes. The pH is fairly stable for a few seconds. The probes on this gauge are the qualitative difference between this and other gauges. It's likely that if the electronics of the device last long and stay dry, the sensor will outlast every other tds/pH meter I own and use. Customer service also seems to be very good. They ask for the meter reading and your experiences. I replied in detail and they thanked me and offered their help in the future if I needed it. The counter stays on, but the backlight turns off. I only wish it would stay. It may cost a few dollars more. The probe is less likely to become moldy and spoil. Cool fact, the temperature is displayed in F or C and is always shown on screen in pH or tds mode. Nice that you don't have to switch to a separate mode. Many Thanks

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