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Published product information, with original specification labels and units. A missing specification is unknown, not proof that a feature is absent.
Buying decision	Apera Instruments Apera PH20 Pocket pH Tester Kit, AI209 Check price on Amazon (paid link) Amazon affiliate link
Useful for	A small hydroponic grower wanting a documented, dedicated pH tester with a carrying case.
Check first	Measures pH and temperature; conductivity and nutrient composition require other checks.
Published specifications	Model / SKU PH20 / AI209 pH range 0–14.0 pH pH resolution 0.1 pH pH accuracy ±0.1 pH Calibration Automatic 1–3 points; current manual starts with pH 7.00 and 4.00 Temperature 0–50°C; 0.1°C resolution; ±0.5°C accuracy Temperature compensation Automatic, 0–50°C Probe Nonreplaceable glass bulb; single ceramic junction Housing IP67; floats Power 4 AAA batteries Storage Current v6.2 manual: damp cap or pH 4 buffer during daily/weekly use; Apera 3M KCl for storage over one month; never soak in pure water
Other tradeoffs	Fixed pH probe cannot be replaced independently when worn or damaged. 0.1 pH resolution does not support hundredth-unit readings. Requires appropriate buffers and probe storage care; pure water is for rinsing, not immersion storage.
Sources & model details	Published product source ↗ Researched 2026-09-14. Full profile and supporting sources →
Put it to use	Hydroponics guides and equipment → Hydroponic Lettuce: Choose the Harvest, Then Plan Each Crop Stage Hydroponic Basil: Make Room for the Canopy You Will Keep Harvesting Hydroponic Tomatoes or Peppers: Check the Upgrade Before Replacing Your Greens
Check current offer	Check price on Amazon (paid link)

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Apera PH20 Pocket pH Tester Kit, AI209