(360) 800-5535 · Mon–Fri 9am–5pm PST
Earn 319 points for shopping and get $3.19 off your next order. Join Harvest Club for free.
We support operations & licensed facilities with volume pricing, dedicated account managers, and custom equipment consultation.
Carrying separate pH and EC meters into the field means extra gear, extra batteries, and readings that never line up in time. The Bluelab Combo Meter solves this with a single, portable 3-in-1 unit that measures pH, conductivity (EC), and temperature in nutrient reservoirs, run-off, and water supply. If you prefer a more compact, Bluetooth-enabled alternative, the Bluelab OnePen offers similar 3-in-1 functionality in a pocket-sized format.
Individual, replaceable probes give the Combo Meter lasting value: a BNC-connection pH probe you can swap without replacing the whole meter, and a factory-calibrated EC probe that's ready to use immediately. A KCl-filled pH probe cap keeps the probe hydrated between uses, and 2-metre (6.6ft) cables let you take readings in hard-to-reach reservoirs and tanks. For those measuring directly in substrate, the Bluelab Combo Meter with Soil pH Probe offers specialized functionality for media-based testing.
Day-to-day use stays simple: a clear backlit display and easy-to-use buttons make readings fast to check, and 2-point pH calibration with a 30-day reminder keeps accuracy on track. Battery-powered and portable, the Combo Meter goes wherever your grow operation does.
Ready to use immediately, right out of the box.
Reach measurements in hard-to-access reservoirs and tanks.
Built-in 30-day reminder keeps pH readings accurate over time.
Clear screen and easy-to-use buttons make readings fast to check.
| Specification | Value |
|---|---|
| pH Range | 0.0–14.0 |
| pH Resolution | 0.1 |
| pH Accuracy (at 25°C / 77°F) | ±0.1 |
| Temperature Range | 32–122°F (0–50°C) |
| Temperature Resolution | 1°C / 1°F |
| Temperature Accuracy | ±1°C / ±2°F |
| Conductivity (EC) Range | 0.0–9.9 mS/cm |
| Conductivity (EC) Resolution | 0.1 |
| Conductivity (EC) Accuracy | ±0.1 |
| CF Range | 0.0–99 |
| CF Resolution | 1 |
| CF Accuracy | ±1.0 |
| TDS (ppm 500) Range | 0–4,950 |
| TDS (ppm 500) Resolution | 10 |
| TDS (ppm 500) Accuracy | ±50 |
| ppm 700 Range | 0–6,930 |
| ppm 700 Resolution | 10 |
| ppm 700 Accuracy | ±70 |
| Operating Environment | Nutrient solution, 32–122°F (0–50°C) — do not use or store outside this range |
| Power | 2x AAA alkaline battery |
The Bluelab Combo Meter is covered by a 5-year limited warranty.
Yes. It uses a BNC-connection pH probe that can be swapped out without replacing the entire meter.
No. The conductivity probe is factory-calibrated and ready to use immediately.
It measures in EC, CF, ppm 500 (TDS), or ppm 700, so you can work in whichever scale your feeding program uses.
The probes have 2-metre (6.6ft) cables, letting you take readings in reservoirs and tanks that are hard to access directly.
Yes. It's built to measure pH, EC, and temperature in nutrient reservoirs, run-off, and general water supply, and is portable enough to use on the go.
The pH probe comes with a cap that should be filled with Bluelab KCl storage solution to keep it hydrated when not in use, helping extend its accuracy and lifespan.
Our specialists are happy to help. Call us or send a message and we'll get back to you within one business day (most of the time within a few hours.)
Equipping home growers, craft producers, and commercial operations across North America since 2016.
