I'm taking a moment to review a pH meter.
Firstly, here are the three I have tried so far. The yellow no name one was first, it was screw calibration, and it stopped functioning properly within a month. The second one up was purple and cost 15$ US, it was a constant nightmare to adjust pH with it. It proved to be off by more than 1 pH consistently. The third one is the Apera pH meter. It rocks my world, but cost 60$ US on Amazon.
I had a hard time believing how far off I had been with pH previous to using this meter. I checked calibration on both the purple one and the Apera several times. I had been operating a whole point or up to 2 points off and it was no wonder I had so much trouble. For the three months or so I have been using this meter I have had zero problems with pH related, or nutrient related problems. My plants are now growing faster and larger. Thanks to the Apera meter. It runs on rechargeable aaa batteries, and temperature compensation. It comes in a hard case with it's own calibration solutions. The calibration solution bottles are sized so you can just stick the meter in without having to pour it or measure it. It easily calibrated with a few button pushes, and has remained accurate since. I rinse it after every use, and fill the cap with water for storage. I am so confident in it that I can now leave for a day or three without worrying about the reservoir.
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Brand: Apera Instruments
Model: PH20
Website:
http://aperainst.com/pocket-testers/ph20-value-ph-pocket-tester/
Simply the most reliable pocket pH tester with the best value for all kinds of routine testing, such as tap water/drinking water testing, agriculture, aquaculture, swimming pool, education, etc. The Apera Instruments PH20 Value pH Tester Kit simply provides reliable and quick pH measurements for most regular water solutions' pH testing, such as hydroponics, pools and spas, homebrewing, winemaking, education, water treatment, cooling towers, etc.
Intelligent Functions
Auto recognition and reminders of stable values improves consistency, saving you the trouble of guessing when to manually hold measurement. Its built-in Self-diagnosis function gives reminders of out-of-range measurement and incorrect calibrations.
- An ultra clear 180˚ viewing angle screen with temp./pH value dual display and indications of completed auto calibrations and stable readings.
- Complete kit with calibration solutions (4.00 and 7.00), AAA batteries, and a lanyard all in a rugged carrying case.
- 1-3 points auto calibration and 0 to 50˚C auto temp. compensation, ±0.1 accuracy with 0 to 14.0 pH measuring range
- Self-diagnosis with out-of -range warning and incorrect calibration warning.
- IP67 Water-proof and dust-proof, floats on water so no need to worry if you drop it in the water by accident.
- Longest 400 hours' continuous operation powered by AAA batteries (with low power warning and auto power off in 8 min if no operation).
Meter’s Technical Specs
- Accuracy: ±0.1 pH, ±0.5˚C.
- Range: 0 to 14.0 pH.
- 0 to 50˚C ATC.
- 1-3 point Auto Calibration with auto buffer recognition.
- up to 2000 hours of operation powered by AAA batteries.
- Smart Self-Diagnosis.
