Lab-grade EC/TDS/salinity measurement — built for the floor of a working facility.
The Apera EC8500 (SKU: AI5522) is a field-hardened portable meter that measures conductivity (EC), TDS, salinity, and temperature in a single instrument. Built around Apera's proprietary platinum black electrode, it delivers ±1% F.S. accuracy across the full 0–200 mS/cm range — verified performance that holds up through feed-water checks, fertigation QC, and runoff testing on the production floor.
The Apera EC8500 is a portable, handheld meter that reads electrical conductivity (EC), total dissolved solids (TDS), salinity, and temperature — four parameters operators track continuously in any serious nutrient program. It belongs to Apera's Premium Series 8500 line, which is positioned between entry-level pocket testers and full benchtop laboratory instruments. The result is a meter that travels with a grower through a multi-room facility without sacrificing the measurement integrity a lab bench unit provides.
At the core of the instrument is Apera's 2301T-S conductivity/temperature electrode, built on BPB (Brush-resistant Platinum Black) cell technology. That electrode is what gives the EC8500 its ultra-wide range — 0 to 200,000 µS/cm (200 mS/cm) — without the accuracy drop-off you see on standard two-cell probes pushed to their upper limit. The integrated temperature sensor feeds the meter's automatic temperature compensation (ATC) so readings are corrected to a reference temperature in real time, not calculated after the fact.
Any licensed cannabis or hemp operation running a nutrient program — whether that's coco, rockwool, DWC, or living soil — needs consistent EC measurement across the grow cycle: input water baseline, mixed feed solution, mid-canopy spot checks, and runoff EC to track salt accumulation. The EC8500 covers all of those use cases in one portable kit.
It is particularly well suited for facilities where multiple staff members are taking readings across multiple rooms or shifts. The GLP data management system stores up to 500 groups of measurements — each logged with value, temperature, date, and time — and exports via USB to Windows-based PCs for records, compliance documentation, or internal reporting. For operations that need to demonstrate documented fertigation QC, that paper trail is built in, not bolted on after the fact.
The foldable stand on the back of the meter body lets it double as a benchtop unit when you are mixing at a reservoir station, so it is not strictly a walk-the-floor tool — it holds its position in a mixing room just as well.
Calibration is 1-to-3-point automatic, recognizing standard conductivity solutions of 84 µS/cm, 1413 µS/cm, 12.88 mS/cm, and 111.8 mS/cm. A built-in self-diagnosis routine checks calibration integrity and flags problems, and a calibration reminder can be configured so the meter prompts staff before drift becomes an issue. The last calibration date is always accessible on screen.
The large backlit LCD displays conductivity (or TDS or salinity, switchable with a single tap), temperature, measurement stability status, and calibration icons simultaneously — no secondary menu required to confirm the reading is settled. A stability indicator icon tells the user when the reading has locked, reducing the operator error that comes from pulling an unsettled value. Auto-lock and auto-power-off are both available to preserve battery life during busy shifts.
User-configurable parameters include temperature unit (°C/°F), cell constant (0.1 / 1 / 10 cm⁻¹), reference temperature, temperature compensation coefficient, and TDS conversion factor (0.40–1.00). That last setting matters — different TDS conversion standards apply to different nutrient solution types, and being able to match the meter to the facility's established conversion factor keeps data comparable across instruments and time periods.
The IP57 rating means the meter body is dust-tight and can survive immersion in up to 1 meter of water for 30 minutes — appropriate for a production environment where the instrument will regularly get splashed, submerged in sample containers, or set down on a wet bench. A silicone socket protector covers the electrode port when not in use, and the rubber grip sleeve protects the body from impact and gives a secure hold in wet conditions.
The kit ships with everything needed to start measuring: the EC8500 meter body, 2301T-S conductivity/temperature electrode, conductivity calibration solution (1413 µS/cm and 12.88 mS/cm), PC-Link communication software, USB communication cable, combined electrode clip, and a hard-shell portable carrying case. Electrode connection uses an 8-pin port. Power is 3 AA batteries. Warranty is 3 years on the instrument and 6 months on the probe.
| Model / SKU | EC8500 / AI5522 |
| Measuring Parameters | Conductivity (EC), TDS, Salinity (ppt), Temperature |
| Conductivity Range | 0–200,000 µS/cm (0–200 mS/cm) |
| Conductivity Accuracy | ±1.0% F.S. ±1 digit |
| Conductivity Resolution | 0.01 / 0.1 / 1 µS/cm; 0.01 / 0.1 mS/cm |
| TDS Range | 0.1 mg/L to 100 g/L |
| Salinity Range | 0–100 ppt |
| Temperature Range / Accuracy | 0–100°C / ±0.5°C ±1 digit |
| Data Storage | 500 groups (value, temp, date, time) — USB output to PC |
| Ingress Protection | IP57 (dust-tight; immersion to 1 m for 30 min) |
| Calibration | 1–3 point auto; standards: 84 µS, 1413 µS, 12.88 mS, 111.8 mS |
| Cell Constant | 0.1 / 1 / 10 cm⁻¹ (selectable) |
The EC8500 reads 0–200 mS/cm (0–200,000 µS/cm) across five sub-ranges. Accuracy is ±1.0% F.S. ±1 digit across the full span, which is the specification that separates it from entry-level meters that lose accuracy above 20 mS/cm. For cannabis nutrient solutions — typically 1–4 mS/cm — the meter is operating well within its optimal zone.
Yes. The GLP data logger stores 500 measurement groups, each tagged with the measured value, temperature, date, and time. The USB port connects to a Windows-based PC running Apera's included PC-Link software for data export, real-time logging, or historical report generation. That output is suitable for inclusion in facility QC records.
Calibration is 1-to-3-point automatic, using standard conductivity solutions that the meter recognizes automatically (84 µS/cm, 1413 µS/cm, 12.88 mS/cm, 111.8 mS/cm). The included kit ships with two calibration standard bottles. The meter stores the last calibration date and can be configured to display a calibration reminder at a user-defined interval. Most commercial operations calibrate weekly or any time the electrode is replaced.
Yes. Runoff EC testing — dipping the probe into a collected runoff sample to monitor salt accumulation — is one of the core use cases. The IP57 rating means the probe and meter body handle repeated immersion and splashing. The stability icon confirms when the reading has settled before you record it, which matters in a production environment where you may be moving quickly through multiple sample points.
The AI5522 kit includes the EC8500 meter body, 2301T-S conductivity/temperature electrode, two conductivity calibration standard bottles (1413 µS/cm and 12.88 mS/cm), PC-Link software, USB cable, electrode clip, and a hard-shell carrying case. Calibration solution is included at purchase. Replacement solution and probe (2301T-S) are sold separately when consumables need refreshing.
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