Bluelab pH Pen

Save $19.99

Sale price$140.00 Regular price$159.99
In stock


Plants get their nutrient from minerals but they can only get all the right minerals they need if certain conditions are right. Think of nutrients like a lock. pH is the key. A key factor that affects food uptake is whether your solution is acid or alkaline. We measure this in pH.

The Bluelab pH Pen also measures the temperature of the solution, as root health is vital to the success of a crop. Temperature affects the growth rate and structure of a plant so a solution temperature of 18 - 22˚C or 65 - 72˚F is recommended.

The hand held pH pen provides a compact quick and handy way to manage the success of your crop to ensure maximum uptake of nutrients.

Teamed with our Bluelab ppm or EC Pen, you have a handy, convenient and accurate system for ensuring optimum plant growth and health.


  • Measures pH and temperature
  • Selectable units for temperature
  • Backlit LCD display
  • Double junction probe (not replaceable)
  • Successful pH calibration indicator
  • Hold reading function
  • Low battery indicator
  • Fully waterproof
  • Auto off function
  • Automatic temperature compensation
  • 1 x AAA alkaline battery included

    Shipping & Shipping Insurance

    Customer Reviews

    Based on 14 reviews
    Adam Langille

    Bluelab pH Pen

    kris mcallister
    Should have gotten one a long time ago!

    Got this unit in (pretty damn quick shipping too) and realized after first use where all my problems were coming from. Cheap vivosun pens were always off, I am color blind so strips and liquids didnt work. Few days of use in coco and I am already seeing much much happier plants with the correct PH.

    Thanks for the hyshield sample - plants are really liking this!!

    Nice Pen. Simple. Missing one thing.

    Easy to use. Calibrates nicely. Waterproof (hopefully). Tip cover has spot for storage solution so it's always soaking - which reduces calibrations. But there is no darn clip built in!?? Super annoying as when I mix - I want to clip it onto my pail. I also should have bought one that had the TDS meter also built in.

    Rodney Ivany

    Very easy to use

    Fast shipping great prices

    I never write reviews but I must say, fast shipping and lowest prices around the web. I will buy again from growdaddy. Legit company

    Payment & Security

    Your payment information is processed securely via our encrypted online checkout, which is compliant with all six PCI standard categories to ensure your data is safe. We do not store credit card details.

    You may also like

    Recently viewed