±0.01 pH accuracy, 3-point auto-calibration, ATC 0–60°C — complete kit, replaceable probe.
The Apera SX620 (AI1223) is a slim, single-button pH pen tester delivering ±0.01 pH accuracy with automatic 3-point calibration and full 0–60°C temperature compensation — sold as a complete kit with premixed calibration buffers and 3M KCl storage solution. Built for daily use in recirculating systems, fertigation lines, and media checks across commercial cannabis and hemp production.
The Apera SX620 is a pocket-format pH pen tester designed for regular liquid pH measurement in demanding field environments. It resolves to 0.01 pH and holds that accuracy across a 0–60°C working range via automatic temperature compensation — meaning readings stay reliable whether you're pulling from a warm reservoir or a cold RO line.
The pen body is slim enough to fit inside a standard test tube, so it works just as well for small-volume spot checks as it does for dipping directly into a sump or res. The probe is user-replaceable (SX625 replacement, sold separately), which extends the life of the meter body and lowers the long-term cost of maintaining calibrated tooling across a multi-room facility.
Calibration runs automatically in up to three points (pH 4.00, 7.00, 10.01) with automatic buffer recognition — the meter identifies the solution it's sitting in and applies the correct endpoint without manual input. A probe invalidation reminder alerts the operator when the sensor is aging and readings may be drifting, so you catch the problem before it affects a crop.
Any cultivation team running a recirculating or fertigation system needs a reliable handheld pH reference they can trust on every walkthrough. The SX620 is the tool for daily-use monitoring: reservoir pH before feeding, runoff spot-checks, nutrient mix verification, and water intake testing before it enters the system.
It's particularly practical in multi-bay or multi-tier builds where a single stationary meter can't cover the floor. Keep one in each grow room, assign one per cultivation tech, or use it as a field backup to your inline sensors — because a $90 pen tester that reads accurately is a much cheaper insurance policy than a missed pH swing in week five of flower.
The complete-kit format matters here: premixed buffers at pH 4, 7, and 10 plus 3M KCl storage solution are included in the carrying case, so the pen is calibrated and ready to hand off without sourcing solutions separately. For multi-site operators standardizing on one pocket tester SKU, the SX620's consistent kit contents simplify onboarding and supply ordering.
Single-button operation keeps the workflow fast — one button cycles through measurement and calibration modes. The auto-power-off function protects battery life in environments where pens get set down between tasks, and the low battery alarm prevents a dead meter from going unnoticed mid-shift.
The °F/°C toggle is a minor but useful detail for teams whose IPM or fertigation documentation uses one unit system while the meter defaults to another. Stable-value recognition on the display indicates when the reading has settled, removing the guesswork of manually timing a dip and hold.
The slim replaceable probe (8mm diameter) is the SX620's most operationally significant feature for commercial growers. pH probes have a finite lifespan — glass membranes age, junctions clog, and accuracy drifts. Being able to swap the SX625 probe into the same meter body rather than discarding the entire instrument keeps calibration history consistent and reduces waste across a multi-meter inventory.
In a commercial cannabis or hemp facility, pH control is non-negotiable at every input point: RO or municipal source water, mixed nutrient solution, fertigation delivery, and runoff from the medium. The SX620 covers all of these with a single, portable, easy-to-calibrate instrument that any team member can use without training beyond a five-minute orientation.
Pair it with an EC/TDS pocket tester for a complete hand-check toolkit — between the two instruments a cultivation tech can verify any nutrient solution or water input in under two minutes without walking to a control room. For facilities running Athena, TechnaFlora, or any other liquid nutrient program, having accurate, freshly calibrated pH at the reservoir before every feed is standard protocol; the SX620 makes that check fast and consistent.
Hydro Supply Co. supplies the Apera SX620 kit and SX625 replacement probes to licensed cannabis and hemp operators nationwide. Request a quote for single-unit or multi-unit facility orders.
| Model | Apera SX620 |
| SKU | AI1223 |
| pH Measurement Range | -1 to 15.00 pH |
| pH Accuracy | ±0.01 pH |
| Temperature Compensation Range | 0–60°C (32–140°F) Automatic (ATC) |
| Calibration | Automatic, up to 3 points — pH 4.00, 7.00, 10.01; auto buffer recognition |
| Probe | Slim replaceable probe (SX625); fits standard test tubes |
| Intelligent Functions | Auto power-off, low battery alarm, probe invalidation reminder, °F/°C toggle |
| Kit Contents | SX620 meter, premixed calibration buffers (pH 4, 7, 10), 3M KCl storage solution, carrying case |
| Warranty | 2 years (instrument); 6 months (probe) |
The SX620 calibrates at up to three points — pH 4.00, 7.00, and 10.01 — with automatic buffer recognition. The kit (AI1223) ships complete with premixed calibration solutions at all three pH values plus 3M KCl storage solution, all in a portable carrying case. No separate buffer sourcing is needed out of the box.
Apera's probe invalidation reminder alerts you when the sensor is aging and accuracy may be compromising. The replacement probe is the Apera SX625, sold separately. Replacing the probe extends the meter body's service life without discarding the instrument or re-establishing a new calibration baseline — cost-effective for facilities running multiple pens.
The SX620 uses automatic temperature compensation (ATC) across a 0–60°C range. The built-in temperature sensor adjusts pH readings in real time as sample temperature changes, so you get accurate results whether you're testing a cold RO line or a warm recirculating reservoir without manually entering a temperature correction.
The SX620 is designed for regular field use in wet environments. While operators should refer to the product manual for the specific IP rating, the unit is built for daily contact with water solutions in production settings — and the auto power-off protects it when set down between tasks. For fully submersible or IP67-rated requirements, Apera's PH20 or PH60 series may be more appropriate.
Yes. Hydro Supply Co. supplies the Apera SX620 (AI1223) and SX625 replacement probes to licensed cannabis and hemp operators across the United States. Request a quote for multi-unit orders — we can coordinate delivery to single or multiple facility locations.
Get operator-direct pricing and availability. We supply licensed commercial cultivators nationwide.
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