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, 2 AA batteries
• Auto off function

Probe Tips

  • All probes are interchangeable between all Bluelab products
  • All probes carry a 6 month warranty
  • Proper hydration of ph probes is vital to maintain wick
  • All pH probes eventually need to be replaced—they can only house so much reference solution
  • KCl storage solution is required for optimum probe maintenance
  • RO water will reduce probe life
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 (electroconductivity) is another form of measurement for TDS. pH is the measure of acidity or alkalinity which dictates plant uptake of particular elements.

How often should I calibrate?

Clean & calibrate meters every 30 uses or 30 days for best results. A 7 & 4 will appear on the screen of the combo meters to indicate it is properly calibrated--when it goes away, it is time to calibrate. A check mark will appear on the screen of all other meters to indicate it is properly calibrated--when it goes away, it is time to calibrate. Calibration process has been made uniform across entire product line as of 2 years ago. Calibration instructions are printed on the back of each meter. Always calibrate at 7.0 first, then 4.

Does Bluelab have a technical support line?

Yes they do. Their USA tech support line is (909) 599-1940.

What is causing calibration to run slowly?

The wick is dry. Proper hydration of pH probes is vital to maintain the wicks inside.

Can I use reverse osmosis (RO) water to store or calibrate my meter?

Do not use RO water to test meters–-there are no dissolved solids to read.

Is it important to know the scale of nutrients being used?

It is very important to know the scale of the nutrients you are using. General Hydroponics & Dutch Master use the 500 scale. Most other nutrients use the 700 scale.

Does Bluelab offer technical product training to retail stores?

Yes! Their Growers Success Program (GSP) is offered to selected stores currently. Stores are trained on use of all meters, troubleshooting returns, calibrating units, replacing probes, etc. This training program will be expanding to more stores soon!

Can I use any vendor's calibration solution?

It is recommended to use only same brand solutions (Bluelab calibration solutions with Bluelab meters, etc.).

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.