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HM Digital PH-80 pH HydroTester, 0-14 pH Range, 1 pH Resolution, +/- 2% Readout Accuracy
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The PH-80 is an economically priced, reliable pH meter (aka pH pen or pH tester) that is ideal for testing applications such as hydroponics & gardening, pools & spas, aquariums & reef tanks, water ionizers, drinking water, boilers and cooling towers, wastewater and more. The PH-80 measures pH and Temperature. Features include one-touch automatic digital calibration,water resistant body, simultaneous temperature display, sleek, lightweight design, a large LCD display, Automatic Temperature Compensation (ATC), Auto-off function, data-hold function and low-battery indicator. Each meter includes storage solution and a single use pH 7.0 buffer pack. The PH-80 is factory calibrated for your convenience and can easily and quickly be recalibrated with digital calibration to pH 4.0, 7.0 or 10.0 using the meter's simple one-touch process. Includes a cap, batteries, storage solution and pH 7.0 buffer.
From the Manufacturer
NEW The PH-80 is an economically priced, reliable pH meter that is ideal for testing applications such as hydroponics & gardening, pools & spas, aquariums & reef tanks, water ionizers, drinking water and more. FEATURES ?Measures pH and Temperature ?One-touch automatic digital calibration ?Water resistant ?Simultaneous temperature display ?Sleek, lightweight design ?Large LCD display ?Automatic Temperature Compensation (ATC) ?Auto-off function, data-hold function and low-battery indicator ?Includes storage solution in a sponge embedded in a translucent cap ?Factory Calibrated: The PH-80 meter is factory calibration to pH 7.0. The meter can easily and quickly be recalibrated with digital calibration to pH 4.0, 7.0 or 10.0 using the meter's simple one-touch process. ?Includes a cap, batteries, storage solution and pH 7.0 buffer.
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I calibrate on a regular basis, once every week or two. Sometimes, I find that the meter has barely changed in calibration, and I don't need to do anything. Other times, after longer waits between calibrations, I have found a drift of 0.1 to 0.3, which isn't that much at all for my purposes. Luckily, calibration is simple and easy, and all you need is a source of the calibrating liquid and a small cup.
I've abandoned the use of my more precise meter, and instead of buying replacement probes, I just buy another one of these meters every few years. All meters wear out eventually, since it is in the nature of the little glass bulb to slowly erode (which is why you need to recalibrate). In my situation, it makes more sense to get another one of these fine meters with a rapid response time, instead of buying a new probe for the more precise meter with the slower response time. They are all excellent meters, highly reliable, but I have ultimately settled on less precision and a more rapid response.
So, here's how to not have problems with this meter. After you're done taking a reading, rinse with DISTILLED WATER and place it back into its cap as soon as possible. The cap, btw, should always be moist with the solution that came with it. In general, take your reading quickly, rinse, and replace in the cap. The bulb should never be allowed to completely dry. It is a pain in the ass to rinse with distilled water every time, I must admit, but as a result I have pretty accurate readings that don't always need calibration.
I had been using my son in laws tester, so I had something to compare to. The numbers were spot on, easy to read and quick.
Of course time will tell how long it works, but so far I am very satisfied with this purchase.
Digital automatic calibration which can use PH 4.0, 7.0, OR 10.0 calibration solutions which ROCKS as you have more options.
1 year factory warranty in case something fails in the unit, but most PH meters fail due to users not following simple storage instructions which in turn ruins the probe. If you need a reliable meter, this is it.