±0.01 pH accuracy built for turbid, sulfide-heavy water — compliant field testing without babying the probe.
The Apera PH850-WW (AI5531) is a field-grade portable pH meter purpose-built for wastewater, effluents, emulsions, and other turbid or sulfide-containing solutions. Equipped with the Swiss LabSen® 333 POM 3-in-1 pH/Temperature electrode and a rugged IP57-rated body, it delivers ±0.01 pH accuracy in environments where standard glass-bulb probes fail.
The Apera PH850-WW is a portable handheld pH meter from Apera's Value Series, model designation AI5531. It is engineered specifically for professional pH measurement of wastewater, effluents, emulsions, and turbid water solutions that contain sulfides and proteins — media types that foul or clog conventional electrodes quickly.
The kit ships with Apera's Swiss-technology LabSen® 333 POM-body 3-in-1 pH/Temperature electrode. The POM (polyoxymethylene) body is chemically resistant to corrosion, and the probe's open-junction design ensures full contact with solution while resisting clog buildup — no electrolyte refill required. Apera's proprietary blue gel inner solution is non-flowing, eliminating air bubble formation and improving measurement stability even when the probe is held upside-down.
The meter itself reads pH and temperature simultaneously on a large backlit LCD and supports ORP measurement in mV mode with an optional ORP probe (model 301Pt-C, sold separately). A foldable rear stand converts it from a handheld instrument into a benchtop meter when needed.
Licensed cannabis and hemp cultivators generating regulated wastewater — including fertigation runoff, cleaning effluent, and nutrient solution discharge — face increasing state-level pH compliance requirements before discharge to municipal systems or on-site treatment. The PH850-WW is the instrument for that job. Its LabSen 333 electrode handles the sulfide-heavy, high-solids chemistry that destroys standard hydroponics pH pens within weeks.
It is equally suited to cultivation teams monitoring irrigation return water, runoff pH from coco or rockwool systems, and any collection sump where solution chemistry is complex. The IP57 waterproof rating means it survives a full submersion to one meter and holds up in wet grow rooms, outdoor sites, and processing areas. If your team is already using a pocket-style pH tester for effluent checks, this meter gives you a meaningful step up in probe durability, reading stability, and documentation capability.
Compliance officers, cultivation managers, and facility engineers sourcing equipment for multi-site operations will appreciate the standardized BNC connector — the meter is compatible with the full Apera LabSen electrode line, so the same meter body can be redeployed with a different probe for other applications across a facility.
The LabSen 333 electrode's open junction keeps the reference system in full contact with even heavily suspended solutions, preventing the clogging that plagues ceramic or fiber-junction probes in wastewater. The integrated temperature sensor enables automatic temperature compensation (ATC) across the full 0–80°C measurement range.
Intelligent self-diagnosis flags out-of-range values and electrode degradation before you record a bad reading. Auto-calibration recognizes up to 12 standard buffer solutions (including 1.68, 4.00, 7.00, 10.01, and 12.45 pH) across 1–3 calibration points; electrode slope is displayed after the second and third calibration points so you can monitor probe condition over time.
Additional smart functions include auto power-off to extend battery life (powered by three AAA batteries), a stable-reading icon on the LCD that confirms measurement lock before you log the value, and an auto-hold display mode. The soft silicone grip case absorbs shock and gives a secure hold in wet-gloved conditions. The standard BNC connector means replacement electrodes or specialty probes from the full LabSen catalog drop straight in.
Wastewater pH compliance is not optional in regulated cannabis markets — most state environmental programs require operators to document discharge pH within an acceptable range before effluent leaves the property. The PH850-WW gives cultivation and facilities teams a durable, auditable instrument for that purpose, distinct from the nutrient-solution pH pens used at the fertigation skid.
For large facilities managing multiple drain zones, collection sumps, or phase-separated treatment systems, the PH850-WW's wide temperature range (0–80°C) and corrosion-resistant POM electrode body make it serviceable in heated equalization tanks and in outdoor collection areas where a standard meter would degrade rapidly. The foldable stand lets it double as a benchtop meter at a monitoring station.
Hydro Supply Co. sources the PH850-WW (AI5531) through direct vendor accounts and can coordinate single-unit or multi-unit orders for operators outfitting new facilities or standardizing meter kits across sites. Calibration buffer solutions and replacement LabSen 333 electrodes are available separately. Contact us for a quote.
| Model | PH850-WW |
| SKU | AI5531 |
| pH Range | 0–14 pH |
| pH Accuracy | ±0.01 pH ±1 digit |
| pH Resolution | 0.01 pH |
| Temperature Range | 0–80°C (32–176°F) |
| Temperature Accuracy | ±0.5°C ±1 digit |
| Temperature Resolution | 0.1°C |
| Calibration Points | 1–3 point auto-calibration; recognizes 1.68, 4.00, 7.00, 10.01, 12.45 pH standards |
| Electrode | Swiss LabSen® 333 POM-body 3-in-1 pH/Temperature (open junction, polymer electrolyte, no refill required) |
| Waterproof Rating | IP57 |
| ORP Capability | Yes, mV mode (ORP electrode sold separately, model 301Pt-C) |
Wastewater, effluents, and emulsions often contain suspended solids, sulfides, and proteins that clog or poison the reference junction on standard pH electrodes, causing drift and erratic readings. The LabSen 333 POM electrode on the PH850-WW uses an open-junction design that prevents clogging and a polymer electrolyte that resists sulfide interference — making it far more reliable in these media than a conventional glass-bulb or ceramic-junction probe.
Yes. The LabSen 333 electrode also works with general water solutions, so the same meter can handle fertigation runoff, irrigation water, and sump monitoring. That said, if your primary use case is clean nutrient solution in hydro systems, the standard PH850 or a pocket tester may be a better fit — the PH850-WW's electrode is optimized for dirty water.
Yes. In mV mode, the PH850-WW supports ORP measurement when an ORP probe is connected. The compatible ORP probe is the Apera 301Pt-C, which is sold separately.
After completing a 2- or 3-point calibration, the meter displays the electrode slope value. A slope outside the normal range (typically below ~85% or above ~105%) indicates a degrading probe. The self-diagnosis function will also flag electrode invalidation automatically. Replacement LabSen 333 electrodes are available — contact HSC to add one to your order.
The AI5531 kit includes the PH850-WW portable pH meter, the LabSen 333 POM 3-in-1 pH/Temperature electrode, pH buffer calibration solutions (4.00, 7.00, and 10.01 pH — 50 mL each), a screwdriver for battery access, an instruction manual, and a hard-shell carrying case.
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