pH & EC Meters, Calibration & Control

Shop pH and EC meters, calibration solutions and adjustment products for hydroponic systems and indoor gardening. SteelRoots stocks digital pH meters, EC and conductivity meters, combination testers, pH Up and pH Down solutions, calibration fluids, buffer solutions and probe-care products.

Accurate monitoring helps growers manage nutrient-solution strength and acidity across hand-watered and recirculating systems. Explore dependable testing and maintenance products from trusted horticultural brands, supported by knowledgeable advice, fast UK delivery and discreet plain packaging.

  • Dutchpro pH Down Grow | pH Reducer for Veg Stage
    Dutch Pro

    Dutchpro pH Down Grow | pH Reducer for Veg Stage

    £9.50
    £9.50

    Product Description: Dutchpro pH Down Grow is a high-purity, specialized acidic solution designed to lower your water's pH levels specifically during the vegetative phase. Standard universal...

    Size: 1L
  • Growth Technology pH Up | Potassium Carbonate Liquid
    Growth Technology

    Growth Technology pH Up | Potassium Carbonate Liquid

    £4.50
    £4.50

    Product Description Growth Technology pH Up is a professional-grade, highly concentrated alkaline solution engineered to safely raise the pH levels of water and plant nutrient solutions....

    Size: 250ml
  • Bluelab PH & EC Care KitBluelab PH & EC Care Kit
    Bluelab PH & EC Care Kit
    Bluelab

    Bluelab PH & EC Care Kit

    £22.95
    £22.95

    PH & EC CARE KIT by BLUELAB  Care, hydration and calibration – in one kitMaintaining your Bluelab pH and conductivity probesTo ensure ongoing accuracy and longevity, we...
  • Bluelab PH Care KitBluelab PH Care Kit
    Bluelab PH Care Kit
    Bluelab

    Bluelab PH Care Kit

    £19.99
    £19.99

    pH CARE KIT by BLUELAB Care, hydration and calibration – in one kit! Maintaining your Bluelab pH probes To ensure ongoing accuracy and longevity, we recommend...
  • Essentials LAB Buffer pH 7 calibration solution bottles for accurate pH meter calibrationGardener calibrating a pH meter with Essentials LAB Buffer pH 7 solution in a greenhouse
    Essentials LAB Buffer pH 7 calibration solution bottles for accurate pH meter calibrationGardener calibrating a pH meter with Essentials LAB Buffer pH 7 solution in a greenhouse
    Essentials LAB Buffer pH 7 1L solution for pH meter calibrationGardener calibrating a pH meter with Essentials LAB Buffer pH 7 solution in a greenhouse
    ESSENTIAL LAB

    Essentials LAB pH Buffer 7 Calibration Solution

    £3.95
    £3.95 £0.00

    Essentials LAB pH Buffer 7 for pH meter calibration Essentials LAB pH Buffer 7 is a calibration solution that provides a pH 7 reference point for...

    Size: 250ML
  • Bluelab KCL Storage Solution (100ml) – Official Hydration Fluid for pH Meter Probes and PensBluelab KCL Storage Solution (100ml) – Official Hydration Fluid for pH Meter Probes and Pens
    Bluelab KCL Storage Solution (100ml) – Official Hydration Fluid for pH Meter Probes and Pens
    Bluelab

    Bluelab KCL Storage Solution (100ml) – Official Hydration Fluid for pH Meter Probes and Pens

    £13.95
    £13.95

    Bluelab KCL Storage Solution: Preserving Precision for Your pH Meter Keep your diagnostic tools in peak condition with the official Bluelab KCL Storage Solution. Your pH...
  • Essentials Lab EC Calibration Fluid 2.8mS | CF 28 Buffer Solution
    ESSENTIAL LAB

    Essentials Lab EC Calibration Fluid 2.8mS | CF 28 Buffer Solution

    £3.75
    £3.75 £2.95

    The EC level of your nutrient solution will influence your plants ability to absorb water. If the EC is too high, the roots cannot bring in...

    Size: 250ML
  • Essentials LAB Buffer pH 4 calibration solution in small and 1L bottles for pH meter calibrationGardener calibrating a pH meter with Essentials LAB Buffer pH 4 calibration solution in a greenhouse
    Essentials LAB Buffer pH 4 calibration solution in small and 1L bottles for pH meter calibrationGardener calibrating a pH meter with Essentials LAB Buffer pH 4 calibration solution in a greenhouse
    Essentials LAB Buffer pH 4 1L solution for accurate pH meter calibrationGardener calibrating a pH meter with Essentials LAB Buffer pH 4 calibration solution in a greenhouse
    ESSENTIAL LAB

    Essentials LAB pH Buffer 4 Calibration Solution

    £3.95
    £3.95 £3.95

    Essentials LAB pH Buffer 4 is a calibration solution for compatible pH meters. Regular calibration helps keep readings dependable when checking the pH of nutrient solutions....

    Size: 250ML
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