The Bluelab Combo Meter is a portable, three-in-one digital meter for measuring pH, electrical conductivity (EC), and temperature in nutrient solutions. Designed for growers who need reliable measurements wherever they work, it combines essential nutrient-solution monitoring functions in one handheld device.
With a backlit display, replaceable Bluelab pH Probe, and factory-calibrated conductivity/temperature probe, the Combo Meter makes it easy to check nutrient reservoirs, irrigation water, and runoff during routine growing operations.
Three Measurements. One Meter. Monitor pH, conductivity, and temperature to better understand nutrient availability, solution strength, and growing conditions.
Key Features
pH, EC & Temperature
Measure three essential nutrient-solution parameters with one convenient handheld instrument.
EC, CF & PPM Readings
Select EC, CF, ppm 500 (TDS), or ppm 700 to suit your preferred nutrient measurement scale.
Two-Point pH Calibration
Simple push-button pH calibration with a 30-day reminder helps maintain dependable readings.
Designed for Long-Term Use
The replaceable pH Probe uses a BNC connection, while the conductivity probe requires no routine calibration.
The Science Behind Healthier Plants
Nutrient-solution pH, conductivity, and temperature all influence growing conditions. Monitoring these parameters helps growers identify changes before they affect nutrient management.
pH indicates how acidic or alkaline the nutrient solution is and influences nutrient availability. Electrical conductivity provides an indication of dissolved ionic salts in the solution, helping growers monitor overall nutrient strength. Temperature provides additional context for maintaining suitable solution conditions.
By measuring all three parameters regularly, growers can make more informed adjustments to nutrient solutions and irrigation practices.
Measure the Fundamentals with Confidence
pH Measurement
Measure pH from 0.0 to 14.0 using the included Bluelab pH Probe. Two-point calibration and a calibration reminder support consistent measurement practices.
Conductivity Measurement
Monitor nutrient-solution conductivity using EC, CF, ppm 500 (TDS), or ppm 700. The included conductivity probe is factory-calibrated and does not require routine user calibration.
Temperature Measurement
Measure solution temperature in Celsius or Fahrenheit. Temperature readings help growers assess nutrient reservoir and irrigation-water conditions.
Designed for Everyday Growing Applications
- Hydroponic nutrient reservoirs: Monitor pH, conductivity, and temperature during nutrient management.
- Greenhouse production: Check nutrient solutions used in irrigation and fertigation systems.
- Runoff monitoring: Measure drainage solution to help assess changes in growing conditions.
- Water supply testing: Evaluate incoming water before preparing nutrient solutions.
- Horticultural education: Demonstrate fundamental nutrient solution measurements.
Portable Design with Dedicated Probes
The Combo Meter features separate pH and conductivity/temperature probes with 2-metre (6.6-foot) cables for measuring in hard-to-reach locations. Its handheld design and backlit display make it suitable for use throughout growing facilities.
The Bluelab pH Probe can be cleaned, calibrated, and replaced when necessary. The conductivity/temperature probe is factory-calibrated for convenient day-to-day operation.
For direct soil or substrate pH testing, a compatible Bluelab Soil pH Probe is available separately. The standard Combo Meter package includes the regular solution pH Probe.
Bluelab Nutrient Meters — EC, CF & PPM
Learn about conductivity measurements and the different EC, CF, and PPM scales used when monitoring nutrient solutions.
Product Specifications & Documentation
Technical Specifications
| Product | Bluelab Combo Meter |
|---|---|
| SKU | METCOM |
| Parameters | pH, conductivity, temperature |
| pH Range | 0.0–14.0 pH |
| pH Resolution | 0.1 pH |
| pH Accuracy | ±0.1 at 25°C (77°F) |
| EC Range | 0.0–9.9 EC |
| EC Resolution | 0.1 EC |
| EC Accuracy | ±0.1 EC at 25°C |
| CF Range | 0–99 CF |
| CF Resolution | 1 CF |
| CF Accuracy | ±1 CF at 25°C |
| PPM 500 Range | 0–4950 ppm |
| PPM 500 Resolution | 10 ppm |
| PPM 500 Accuracy | ±50 ppm at 25°C |
| PPM 700 Range | 0–6930 ppm |
| PPM 700 Resolution | 10 ppm |
| PPM 700 Accuracy | ±70 ppm at 25°C |
| Temperature Range | 0–50°C / 32–122°F |
| Temperature Resolution | 1°C / 1°F |
| Temperature Accuracy | ±1°C / ±2°F at 25°C |
| pH Calibration | Two-point calibration; 30-day calibration reminder |
| Conductivity Calibration | Factory-calibrated; no routine user calibration |
| Probe Cable Length | 2 m / 6.6 ft |
| Power | 2 × AAA alkaline batteries |
| Operating Temperature | 0–50°C / 32–122°F |
| Meter Warranty | 5-year limited warranty |
| pH Probe Warranty | 6-month limited warranty |
How to Use, Calibrate & Care
Getting Started
- Install the supplied AAA batteries.
- Connect the pH Probe using the BNC fitting.
- Turn on the meter using its control buttons.
- Calibrate the pH Probe before first use.
- Immerse the appropriate probe in the solution being tested.
- Select the desired parameter and record the measurement.
pH Probe Calibration
The pH Probe requires periodic calibration using appropriate pH calibration solutions. Follow the manufacturer's two-point calibration procedure.
Conductivity Probe Care
The conductivity probe is factory-calibrated and does not require routine calibration. Keep it clean according to Bluelab's maintenance guidance.
pH Probe Storage
Keep the pH Probe tip hydrated using Bluelab KCl Storage Solution. Never store the pH Probe dry or in distilled, deionized, or reverse-osmosis water.
Clean and calibrate the pH Probe regularly and follow the official instructions for safe handling and storage.
Product Manual & Documentation
Access the manufacturer's official Bluelab Combo Meter product information, user manual resources, setup instructions, and probe maintenance guidance.
View Bluelab Combo Meter Guide & Manual Bluelab Manual DownloadsWhat's Included in the Box
- 1 × Bluelab Combo Meter with Conductivity/Temperature Probe
- 1 × Bluelab pH Probe
- 1 × Bluelab pH Probe Holder with Suction Cup
- 1 × Bluelab pH 7.0 Calibration Solution Sachet — 18 ml
- 1 × Bluelab pH 4.0 Calibration Solution Sachet — 18 ml
- 1 × Bluelab KCl Storage Solution Sachet — 18 ml
- 2 × AAA Alkaline Batteries