Bluelab EC Pen - Temperature Compensated Digital EC Tester

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  • Bluelab - a proven track record for accuracy and reliability
  • Provides a digital readout of the conductivity of your nutrient solution
  • Temperature compensated for improved accuracy
  • 4 scales to select from - EC, CF, PPM500 and PPM700
  • Backlit display
  • Hold reading function
  • Made of tough plastic
  • Simple to use and effective
  • Simple calibration process with 30-day indicator
  • Low battery indicator
  • Displays the temperature in ºC or ºF
  • Water resistant
  • Shock resistant
  • Automatic power-off to conserve battery life


Bluelab EC Pen – Temperature Compensated Conductivity Tester

A meter to measure the strength of your nutrient solution is one of those really necessary items for enthusiastic hydroponics growers. Bluelab's EC Pen features the same robust build quality, accuracy and reliability that make Bluelab testing equipment the default choice for growers across the world.

Check out our complete water conditioning toolkits, which come with an EC meter, pH meter, pH up & down, pH buffer, chlorine neutraliser, jug and syringes. Choose between Essentials and Bluelab versions.

How the Bluelab EC Pen Works

The Bluelab EC Pen measures the electrical conductivity of your nutrient solution via electrodes on the bottom end and then displays the measurement on an LCD display. This allows the user to fine-tune the strength of their nutrient solution for optimal plant-growth. The electrodes and temperature sensor (for temperature compensation) are protected by a slotted plastic shroud on the bottom of the unit, which is attached via a connecting chord. The Bluelab EC Pen should be calibrated before use and we also recommend that the unit is recalibrated every 10 measurements or so in order to maintain its accuracy. The Bluelab EC Pen is shock resistant and water resistant, but not fully water-proof so it should never be submerged. The unit will automatically switch itself off to preserve battery life if it is not used for several minutes.

Looking for a full water conditioning kit?

Take a look at our hand picked, Bluelab water conditioning kit and see what savings can be had £££

Bluelab Expert Water Conditioning Toolkit


1 x Bluelab EC Pen with instructions

How to use the Bluelab Digital EC Pen

Check out the One Stop Grow Shop Blog to find out how to control nutrient strength.

To use, make up your nutrient solution according to the nutrient manufacturer's recommended schedule and stir it well. Press the ON/OFF button on the Meter and dip the end of it into the solution so that the probe-shroud is submerged and give it a little shake to remove bubbles trapped within the shroud. Keep it still and wait for a few moments so that the probes can equalise to the same temperature as the solution. When the meter beeps, it indicates that it has finished taking its measurement. The number displayed on the LCD readout is the electrical conductivity of the nutrient solution in EC.

To switch to a different unit of measurement, press and hold the 'units' button until the display starts flashing, then short press the 'units' button to flick through the different combinations of Centigrade /Fahrenheit and PPM/EC. To ascertain CF levels, simply multiply the EC value by 10.

The nutrient solution can now adjusted to bring it to the correct strength by adding more nutrient or by diluting with water as necessary. Further readings can be taken after adding more nutrient or diluting it until the nutrient strength is just right.

The Meter can be switched off by pressing and holding down the ON/OFF button for 3 seconds. If the Meter is not used for several minutes then it will switch itself off in order to preserve battery life. Always rinse the probes with fresh water and dry before and after every test. Soak the probes in a cup of fresh water for 15 to 30 minutes before replacing the protective cap and storing.

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