BlueLab Combo Meter


It's all you need for simple and reliable crop management and it's all within arm's reach!

The Bluelab Combo Meter is a conductivity, pH and temperature meter all in one.

The Bluelab pH Probe and the Bluelab Conductivity/Temperature Probe are simply placed into the solution and the selected reading is displayed on screen.

As the Bluelab Combo Meter is portable and does not require a power supply to operate, it can be used anytime and anywhere to help you manage your crops daily nutrient requirements.

Calibration of the pH is simple with the push buttons on the meter and fresh calibration solutions. Conductivity and temperature do not need to be calibrated as this is locked in during manufacture.

Display options available in °C, °F, EC, CF, ppm 500 and ppm 700.

• Lightweight and portable
• Large easy to read display
• No calibration required for conductivity and temperature
• Successful pH calibration indicator
• Replaceable double junction pH probe
• Low battery indicator
• Simple push button pH calibration
• Battery operated
• Auto off function


2.0 lbs.
7.6L x 7.7W x 1.7H
5 Year

Why are PPM, TDS, pH and EC important?

PPM and TDS are abbreviations that represent the concentration of elements in a solution or atmosphere. PPM is short for parts per million and TDS for total dissolved solids. EC (electro conductivity) is another form of measurement for TDS. PH is a measure of acidity or alkalinity which dictates plant uptake of particular elements.

My pH meter doesn't hold calibration. How often should I recalibrate it?

pH meters do need to be calibrated by the user every day since the membrane does change and is affected by the temperature as well. If pH values are very critical then it will need to be recalibrated several times a day, or before each sample test (depending on how critical the value is). Uncontaminated calibration solution is very important as well. For each calibration, pour some solution in a separate container. Keep out of sunlight and away from heat.

What is the suggested pH range for my hydroponic system and soil plants?

Hydroponic and soil gardens differ in the fact they both need different pH ranges for nutrients to be made available for plant absorption. Maintain a pH between 5.0 and 6.5 for hydroponic gardens and 6.0 to 7.0 for soil applications.