Dip-and-read salinity testing built for production environments — no bench required.
The Apera AI236 Compact Salinity Pen is a purpose-built pocket tester designed for fast, reliable salinity readings in irrigation water, nutrient reservoirs, and runoff checks. Apera's platinum-coated sensor with automatic temperature compensation (ATC) delivers consistent accuracy across variable grow-room conditions without the bulk or complexity of a benchtop meter.
The Apera AI236 is a compact, pocket-format salinity pen tester from Apera Instruments' Eco Series. It is purpose-designed for operators who need a fast, grab-and-go salinity check without pulling out a full benchtop unit. The pen uses Apera's platinum-coated conductivity sensor — a more stable and durable electrode design than standard stainless-steel alternatives — to convert conductivity into a direct salinity reading expressed in parts per thousand (ppt).
The built-in automatic temperature compensation (ATC) adjusts readings across a wide ambient temperature range, which matters in grow facilities where water temps can shift meaningfully between reservoirs, recirculation tanks, and drain-to-waste lines. Single-button operation keeps the workflow simple: dip the probe, wait for stabilization, read. No menus to navigate, no cables to manage.
Commercial cannabis and hemp cultivation teams that need a reliable spot-check tool for irrigation water, fertigation solution, or runoff salinity will get direct value from the AI236. It's well-suited for IPM technicians, head growers, and fertigation managers who want a dedicated salinity pen that doesn't double as everything else — just an accurate, fast salinity read when you need it.
It also fits any facility running a multi-tester protocol: use your EC pen for conductivity trending, and reach for the AI236 specifically when a salinity value in ppt is the number your SOP calls for. Facilities irrigating with well water, RO-blend, or recirculated nutrient solution benefit from having a compact, waterproof tester that can be kept on the grow floor without worrying about splash or brief submersion.
Apera's platinum-coated sensor is the core differentiator here. Compared to standard stainless-steel electrodes, the platinum coating minimizes electrode polarization over time, which translates to more consistent readings across the sensor's service life and easier maintenance between uses. The ATC circuit compensates automatically for temperature variation, so you're not adjusting your read based on whether the reservoir is at 65 °F or 72 °F.
Stable-reading indication removes the guesswork from when to record a value — the display signals when the measurement has stabilized, which improves repeatability between staff members. The pen is powered by standard AAA batteries, IP-rated for water resistance, and ships as a complete kit: the pen, calibration solution, batteries, and a lanyard. Calibration is straightforward and only needs to be performed periodically to maintain accuracy.
In a licensed cultivation facility, salinity monitoring is part of basic water quality diligence — particularly for operations on well water or municipal sources with variable mineral loads, and for any facility recycling drain-to-waste or running recirculating systems. The AI236 gives you a fast, portable read at any point in the irrigation chain: source water coming in, nutrient solution going out, and runoff at the root zone.
Because the AI236 is a dedicated salinity pen rather than a multi-parameter unit, it integrates cleanly into a broader water quality toolkit. Pair it with a dedicated pH pen and an EC meter for a complete, bench-free testing station on the grow floor. The compact pen form factor means it travels easily between rooms, greenhouse bays, or multiple cultivation sites without the overhead of carrying a full meter kit. For national operators managing multiple licensed facilities, standardizing on a single, consistent salinity tester across sites simplifies SOP documentation and staff training.
| SKU | AI236 |
| Brand | Apera Instruments |
| Series | Eco Series Compact Pen |
| Salinity Range | 0–100 ppt (0–100,000 ppm) |
| Accuracy | ±1.5% of full range |
| Sensor Type | Platinum-coated conductivity sensor |
| Temperature Compensation | Automatic (ATC), 32–140 °F (0–60 °C) |
| Display | LCD with stable-reading indicator |
| Operation | Single-button |
| Power | 2 × AAA batteries |
| Kit Contents | Pen tester, calibration solution, AAA batteries, lanyard |
An EC meter reports conductivity in mS/cm or μS/cm. The AI236 converts that conductivity measurement into a direct salinity value expressed in parts per thousand (ppt), which is the unit commonly referenced in water quality SOPs and regulatory reporting for agricultural operations. If your protocol calls for a ppt salinity value, a dedicated salinity pen gives you that number directly without a manual conversion step.
Apera's platinum-coated sensor is designed to hold calibration well between service intervals. For production cultivation use, performing a single-point calibration with the included solution on a regular schedule — typically once per month or per Apera's recommended interval — is sufficient to maintain measurement accuracy. The pen includes calibration solution in the kit.
The AI236 is designed with water-resistant construction appropriate for the splash and humidity conditions typical of commercial cultivation environments. The pen form factor and IP-rated housing mean incidental water contact during irrigation checks or reservoir sampling is not a concern. Always refer to Apera's IP rating documentation for the specific submersion limits.
Yes. The AI236's 0–100 ppt range covers both low-salinity source water (RO, municipal, well) and the higher-salinity fertigation or nutrient solution concentrations typical in commercial cannabis and hemp production. The ATC feature ensures accurate readings regardless of whether the sample water is at reservoir temperature or ambient room temperature.
Use the Request a Quote button on this page. Pricing through HSC is handled directly — we maintain a direct account with Apera, so the quote you receive reflects our direct-account pricing rather than open-market retail rates. A team member will follow up promptly with a quote and lead-time details.
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