
Lab-grade pH in wastewater, suspensions, and organic nutrient solutions — field-ready.
The Apera PH60-WW (AI3721) pairs the proven PH60 meter body with the Swiss-engineered LabSen 335 electrode — purpose-built to deliver ±0.01 pH accuracy in the dirty, particulate-laden liquids that defeat standard pH pens: runoff from coco and rockwool, nutrient slurries, emulsions, and organic teas. IP67-rated, 3-point auto-calibrating, and field-portable with up to 2,000 hours of battery life.
Standard pH electrodes rely on a ceramic junction and liquid KCl electrolyte. In clean water, that works fine. In the real substrates of a licensed cannabis or hemp facility — coco runoff, organic nutrient emulsions, fermented teas, suspension-based amendments, or compost extracts — particulates and proteins migrate into the junction, clog it, and cause drift, sluggish response, or flat-out incorrect readings. You calibrate accurately and still get bad data.
Apera's PH60-WW was designed specifically for this problem. The LabSen 335 electrode uses an open junction paired with a polymer electrolyte rather than a liquid-filled ceramic junction. That combination physically prevents the clogging mechanism from occurring in dirty or complex liquids. The result is stable, repeatable measurement in the same media types that render most pocket testers unreliable — without requiring the operator to pre-filter or dilute the sample.
The LabSen 335 is manufactured using proprietary sensor technologies and materials sourced from Switzerland. Its open-junction design combined with a polymer electrolyte eliminates the common junction-clogging failure mode in dirty liquid testing. Beyond the junction, Apera uses a Long-Life Reference System that outperforms standard Ag/AgCl reference electrodes by maintaining reference potential stability over time — which means readings don't drift as the electrode ages and extends overall service life.
A specially formulated blue gel inner electrolyte eliminates air-bubble formation inside the sensor body, which is a common source of erratic, jumping readings on competing electrodes. The built-in temperature sensor enables automatic temperature compensation without a separate probe. The LabSen 335 is a non-refillable, field-serviceable electrode matched to the PH60 meter body via an 8-pin socket — replaceable when worn without retiring the meter.
The PH60 meter body is rated IP67 waterproof and dustproof and is designed to float — critical for environments where a pen tester routinely gets submerged or dropped near a reservoir. Battery runtime reaches up to 2,000 continuous hours on 4× AAA batteries, with a low-battery warning and auto power-off after 8 minutes of inactivity. Tester dimensions are 40 × 40 × 178 mm at 133 g — small enough to carry in a chest pocket through a multi-room facility.
Calibration supports up to 3 points (pH 4.00 / 7.00 / 10.01) with automatic buffer recognition across 5 standard buffers (1.68, 4.00, 7.00, 10.01, 12.45). The three-color backlit LCD (blue = measuring, green = calibration, red = alarm) shows simultaneous pH and temperature. A Stable-Value Recognition function signals via a smiley-face icon when the reading has settled — eliminating the guesswork of manually deciding when to lock a value. Reading alarm settings allow operators to configure high/low pH thresholds; the screen shifts to red when a value goes out of range. Self-diagnosis catches out-of-range measurements and incorrect calibrations before they produce bad data. CE certified.
The AI3721 ships as a complete, ready-to-use package. Included: PH60-WW meter with LabSen 335 electrode pre-installed, premixed pH 4.00 / 7.00 / 10.01 calibration buffer solutions, electrode soaking solution, the Apera CalPod Solution Organizer (a dedicated accessory that organizes buffer vials and streamlines the calibration workflow on-site), AAA batteries, lanyard, and a rugged carrying case. Nothing additional is required to begin taking measurements.
For cultivation operators, this matters practically: grab the case, walk the room, measure runoff from multiple cultivars or irrigation zones, recalibrate on the spot with the included buffers, and store the electrode properly in the soaking solution between uses. The LabSen 335 electrode carries a 6-month warranty; the PH60 meter body carries a 2-year warranty — both backed by Apera Instruments, LLC. Replacement electrodes (LabSen 335) are available separately when the probe reaches end of service life.
| SKU | AI3721 |
| pH Measurement Range | −2.00 to 16.00 pH |
| pH Accuracy | ±0.01 pH |
| Temperature Accuracy | ±0.5°C |
| ATC Range | 0–50°C (32–122°F) |
| Calibration Points | Up to 3-point auto (pH 4.00 / 7.00 / 10.01); 5 buffer types recognized |
| Waterproof Rating | IP67 (floatable) |
| Battery | 4× AAA, DC 3V; up to 2,000 hours continuous (backlight off); auto power-off at 8 min |
| Electrode | LabSen 335 — open junction, polymer electrolyte, Long-Life Reference System, built-in temp sensor |
| Warranty | 2 years (meter body) / 6 months (LabSen 335 electrode) |
| Tester Dimensions / Weight | 40 × 40 × 178 mm / 133 g |
| Certifications | CE |
Standard electrodes use a ceramic junction filled with liquid KCl. Organic matter, fine particles, proteins, and sulfides from coco, organic nutrients, or compost teas migrate into that junction and partially block it, causing slow response, electrode poisoning, and drift that looks like calibration error. The LabSen 335 uses an open junction and polymer electrolyte — there is no liquid junction to clog. This is the specific design intended for exactly these media types and is what separates the PH60-WW from general-purpose pH pens.
Apera's Long-Life Reference System extends service life compared to standard Ag/AgCl electrodes, but electrode lifespan in dirty or complex media still depends on frequency of use, proper storage between sessions (in the included soaking solution), and rinsing with clean water after each measurement. The electrode carries a 6-month warranty. Replacement LabSen 335 electrodes are available separately, and swapping the probe does not require replacing the meter body.
Yes. The LabSen 335 is purpose-built for dirty liquids but also works well in general aqueous solutions. Operators can use the same meter for both feed-water and runoff checks without switching instruments.
The kit includes premixed pH 4.00, 7.00, and 10.01 buffer solutions plus soaking solution. The PH60 meter supports up to 3-point auto calibration with automatic recognition of 5 buffer types: 1.68, 4.00, 7.00, 10.01, and 12.45. The CalPod Solution Organizer is also included to streamline the calibration process in the field.
The PH60 meter body is rated IP67 — fully dustproof and submersible, and designed to float. It is appropriate for humid greenhouse and indoor grow environments. Auto power-off activates after 8 minutes of inactivity to preserve the up-to-2,000-hour battery life.
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