Hydroponics

Calibration Solution Kit — pH 4.0, pH 7.0 & 2.77 EC (3 × 500 ml)

4.4 11 reviews 1 min read

Calibration Solution Kit — pH 4.0, pH 7.0 & 2.77 EC (3 × 500 ml)

Product description

This kit contains one bottle each of pH 4.0 and pH 7.0 calibration solutions plus a 2.77 EC conductivity standard. Each solution comes pre-mixed and ready for immediate use—no dilution required.

The liquids are supplied in 500 ml bottles, providing enough volume for many calibration cycles and routine maintenance tasks. Their size suits regular verification in both small grow operations and bench-top testing.

Regular calibration with these standards helps remove measurement drift that can influence plant health, nutrient dosing and water quality in hydroponic systems. Using the correct standards keeps pH and EC/PPM readings dependable.

These solutions are ideal for confirming probe accuracy after cleaning or whenever meter performance is in question. Simply pour the appropriate standard, immerse the probe, and adjust your meter to the known value.

Because the solutions are pre-measured, they reduce the chance of preparation errors and save time during maintenance checks. Store the bottles capped and use them for repeated verifications as part of your calibration routine.

Pros

  • Pre-mixed, ready-to-use standards
  • Adequate 500 ml bottles for multiple calibrations
  • Covers both pH and EC verification points

Cons

  • Higher cost than generic options
  • Not a refill/concentrate kit
  • Requires proper storage after opening

VerdictA reliable set of pre-mixed calibration standards for anyone relying on pH and EC/PPM readings. The three 500 ml bottles cover common calibration points and help confirm probe performance after cleaning. Good choice for growers and technicians who need repeatable, accurate meter results.

Reviews

  1. The private reviewer 5/5

    Exactly as expected

    Just the calibration fluids I wanted — nothing surprising, works fine.

  2. Chris neill 5/5

    Arrived as ordered

    Came on schedule and included everything I expected.

  3. M Marks 5/5

    Essential for accurate readings

    If you rely on a pH or dissolved solids meter this kit is essential. Not the cheapest option, but very accurate. For a successful grow you need correct pH and nutrient strength—don’t cut corners.

  4. Kimberley 5/5

    Good value

    Solid purchase—good deal and I’ll buy again.

  5. luis 5/5

    Well packaged and effective

    Everything was sealed and new. Read the labels and instructions on each bottle; they work well with other meters.

  6. Jesse 5/5

    Does the job

    Performs well when used to calibrate meters.

  7. Mark 3/5

    Shipping claim was off

    The promised quick shipment wasn’t accurate. Packaged soon but took a week to reach the carrier.

  8. nicolas beaudoin 4/5

    A bit costlier but convenient

    Slightly more expensive but delivered right to my door!

  9. Emonte85 5/5

    Fast delivery, sealed bottles

    Bottles arrived sealed and exactly as described. Delivery was quick and I’m very satisfied.

  10. patrick fantozzi 1/5

    Missing item

    I received the pH bottles but not the EC/PPM solution. I messaged support and never got a reply.

  11. Trish 5/5

    Quick arrival

    They showed up fast. I haven’t used them yet but the packaging looked right.

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