Lab-grade pH for the smallest samples — down to 15 µL, built for biological and nutrient work.
The Apera Instruments PH700-MS (AI5017) is a benchtop pH meter purpose-built for micro-volume water solutions, biological fluids, and protein-containing samples. Equipped with the Swiss-engineered LabSen 241-3SP electrode, it delivers ±0.01 pH accuracy with a minimum sample volume as low as 15 microliters — giving your lab team precise data without burning through valuable extract or tissue material.
The Apera PH700-MS is a dedicated benchtop pH and temperature meter from Apera's 700-series lab lineup. Where a standard benchtop meter requires a conventional dip volume, the PH700-MS pairs the PH700 meter body with the LabSen 241-3SP — a Swiss-technology glass micro-electrode engineered specifically for micro-volume water solutions, biological matrices, and protein-containing liquids such as serum or microbiological samples.
The LabSen 241-3SP uses a micro cylindrical glass membrane (3 mm tip, 4 mm stainless steel shaft) and Protelyte electrolyte — a specialized oily reference solution formulated for protein-laden samples that would clog or contaminate a standard gel-filled reference junction. A long-life reference system built from a glass tube, AgCl, and a reference silver wire maintains junction stability over an extended service life. With the optional ultra-micro container, the minimum testable volume reaches 15 microliters — a critical capability when sample material is limited and repeat testing is not an option.
Commercial cannabis and hemp operations running in-house tissue testing, extract QC, or nutrient formulation work generate small, high-value samples that standard electrodes simply can't handle efficiently. The PH700-MS is built for exactly that environment: a regulated lab bench where volume is scarce, accuracy is non-negotiable, and downtime between tests needs to be minimal.
It's equally relevant for operations that want to verify pH on small-batch nutrient mixes, enzyme or protein-containing additives, or biological inoculants before they hit the reservoir or substrate. If your compliance or quality program calls for documented, logged pH verification at the lab level — rather than a handheld pen at the fertigation skid — this meter gives you the data traceability and measurement precision to back it up.
Calibration runs 1–3 points automatically with self-diagnosis and electrode condition display, so technicians can confirm the electrode is performing before recording a result. The meter supports pre-mixed buffer solutions at pH 4.00, 7.00, and 10.01 (included in the kit). Automatic temperature compensation spans 0–100°C, keeping readings reliable across sample temperatures. Max/Min reading mode lets you track peak and minimum values over a measurement period without manually watching the display.
The PH700-MS stores up to 50 data sets internally — enough for a full day of discrete sample events without connecting to a PC. The housing carries an IP54 rating: splash-proof and dust-proof, suited to bench environments where nutrient concentrates, solvents, or moisture are a daily reality. BNC electrode connectivity means the LabSen 241-3SP is interchangeable with other Apera BNC-compatible electrodes if your testing protocol expands. The kit ships with a dual-electrode holder (accommodates up to two electrodes simultaneously), three 50 mL bottles of pre-mixed calibration solutions, and everything needed to start measuring on day one.
Most cultivation facilities that run a dedicated lab station already have a general-purpose benchtop meter for fertigation QC. The PH700-MS fills the gap that meter leaves: small-volume biological or protein-containing samples where a standard electrode produces unstable readings or requires more material than you can spare. Think post-extraction pH verification, tissue culture prep, enzyme-based additive confirmation, or small-batch R&D formulations.
The two-year instrument warranty and six-month electrode warranty align with the calibration cycle expectations of a compliance-tracked lab. When the LabSen 241-3SP electrode reaches end of service life, it's a field-replaceable BNC unit — you replace the probe, not the meter body. For facilities scaling their quality programs or preparing for state-level testing audits, having a dedicated micro-volume benchtop meter in the log creates a clear chain of measurement documentation that a handheld simply cannot provide.
| Model / SKU | Apera PH700-MS / AI5017 |
| Electrode Included | LabSen 241-3SP pH/Temp. (Swiss sensor technology) |
| pH Measurement Range | 0–14.00 pH |
| pH Accuracy | ±0.01 pH |
| pH Resolution | 0.01 pH |
| Minimum Sample Volume | ≥15 µL (with ultra-micro container); ≥30 µL standard |
| Temperature Compensation | Automatic, 0–100°C |
| Calibration | 1–3 point auto-calibration; buffers pH 4.00 / 7.00 / 10.01 |
| Data Storage | 50 data sets |
| Ingress Protection | IP54 (spill-proof and dust-proof) |
| Electrode Connector | BNC |
| Kit Includes | Meter, LabSen 241-3SP electrode, dual electrode holder, 3×50 mL pre-mixed calibration solutions (pH 4/7/10) |
The LabSen 241-3SP uses a micro cylindrical glass membrane (3 mm tip) and Protelyte electrolyte — a specialized oily reference solution formulated for protein-containing and viscous samples. Standard gel-filled electrodes can clog or produce unstable readings in biological matrices; the 241-3SP's reference system is engineered to stay stable in those environments. The stainless steel protective shaft also protects the slim glass tube from mechanical damage.
Yes, with the optional ultra-micro container (sold separately). The LabSen 241-3SP can measure down to 15 microliters when used with that accessory. Without it, the minimum recommended volume is approximately 30 microliters.
The LabSen 241-3SP includes temperature measurement capability (it is listed as a pH/Temp. electrode in this kit configuration), enabling automatic temperature compensation across 0–100°C without a separate probe. Automatic temperature compensation is active as long as the electrode is properly connected.
The meter supports 1–3 point automatic calibration. Pre-mixed calibration solutions at pH 4.00, 7.00, and 10.01 are included in the kit (50 mL each). The self-diagnosis function and electrode condition display let you verify electrode health before each calibration session.
The meter stores up to 50 data sets internally and features a Max/Min reading mode for tracking measurement ranges over time. For facilities requiring a paper or digital log, data can be recorded from the on-board storage. The ±0.01 pH accuracy and traceable auto-calibration with electrode condition display support the documentation rigor expected in licensed cannabis lab environments. If your SOP requires USB data export, review the PH800-series meters in the Apera lineup for GLP data management functionality.
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