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- PH/EC/PPM/TDS Meters
- Calibration & Reference Solutions
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Collection: Calibration & Reference Solutions

Shop our selection of calibration and reference solutions to help keep your PH and EC/PPM/TDS meters calibrated and reading accurately.

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Athena (1 product)
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Microbe Life Hydroponics (2 products)
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Athena (1 product)
Bluelab (7 products)
Chemboys (2 products)
Cutting Edge Solutions (1 product)
CYCO (1 product)
Front-Row AG (1 product)
General Hydroponics (5 products)
GroStar (4 products)
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Meters & Calibration Solutions (34 products)
Plant Nutrients & Supplements (3 products)

Meters & Calibration Solutions (34 products)
Plant Nutrients & Supplements (3 products)

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37 products

Bluelab 4.0 pH Calibration Solution

Bluelab 4.0 pH Calibration Solution

Regular price From $2.00 USD

Regular price ~~$1.80 USD~~ Sale price From $2.00 USD
Unit price per
Bluelab 7.0 pH Calibration Solution

Bluelab 7.0 pH Calibration Solution

Regular price From $2.00 USD

Regular price ~~$1.80 USD~~ Sale price From $2.00 USD
Unit price per
Bluelab pH Probe KCl Storage Solution

Sale

Bluelab pH Probe KCl Storage Solution

Regular price From $13.00 USD

Regular price ~~$14.83 USD~~ Sale price From $13.00 USD
Unit price per

Sale
General Hydroponics pH Control Kit

Sale

General Hydroponics pH Control Kit

Regular price $15.00 USD

Regular price ~~$22.98 USD~~ Sale price $15.00 USD
Unit price per

Sale
General Hydroponics PRO pH

Sale

General Hydroponics PRO pH

Regular price From $76.00 USD

Regular price ~~$124.86 USD~~ Sale price From $76.00 USD
Unit price per

Sale
Front Row Ag Clean Up

Sale

Front Row Ag Clean Up

Regular price $60.00 USD

Regular price ~~$96.00 USD~~ Sale price $60.00 USD
Unit price per

Sale
General Hydroponics pH Up Liquid

Sale

General Hydroponics pH Up Liquid

Regular price From $8.47 USD

Regular price ~~$9.72 USD~~ Sale price From $8.47 USD
Unit price per

Sale
Bluelab Probe Care Kit - pH

Sale

Bluelab Probe Care Kit - pH

Regular price $21.00 USD

Regular price ~~$24.00 USD~~ Sale price $21.00 USD
Unit price per

Sale
Hanna GroLine Quick Calibration Solution

Hanna GroLine Quick Calibration Solution

Regular price From $3.00 USD

Regular price ~~$3.00 USD~~ Sale price From $3.00 USD
Unit price per
Apera GroStar pH Probe Maintenance Kit

Sale

Apera GroStar pH Probe Maintenance Kit

Regular price $17.00 USD

Regular price ~~$23.99 USD~~ Sale price $17.00 USD
Unit price per

Sale
Apera GroStar EC Calibration Kit 2.77EC

Sale

Apera GroStar EC Calibration Kit 2.77EC

Regular price $11.00 USD

Regular price ~~$14.99 USD~~ Sale price $11.00 USD
Unit price per

Sale
HM Digital 1000 ppm TDS Calibration Solution 3 oz

HM Digital 1000 ppm TDS Calibration Solution 3 oz

Regular price $9.49 USD

Regular price ~~$9.49 USD~~ Sale price $9.49 USD
Unit price per
CYCO pH Up

Sale

CYCO pH Up

Regular price $21.00 USD

Regular price ~~$40.90 USD~~ Sale price $21.00 USD
Unit price per

Sale
Bluelab Nutrient Probe Care Kit Conductivity

Sale

Bluelab Nutrient Probe Care Kit Conductivity

Regular price $15.00 USD

Regular price ~~$17.00 USD~~ Sale price $15.00 USD
Unit price per

Sale
General Hydroponics pH Down Liquid

Sale

General Hydroponics pH Down Liquid

Regular price From $8.47 USD

Regular price ~~$9.72 USD~~ Sale price From $8.47 USD
Unit price per

Sale
Microbe Life Hydroponics pH UP

Sale

Microbe Life Hydroponics pH UP

Regular price $14.39 USD

Regular price ~~$18.99 USD~~ Sale price $14.39 USD
Unit price per

Sale
Microbe Life Hydroponics pH DOWN

Sale

Microbe Life Hydroponics pH DOWN

Regular price $14.39 USD

Regular price ~~$18.99 USD~~ Sale price $14.39 USD
Unit price per

Sale
House & Garden pH + Osmosis Stabilizer

Sale

House & Garden pH + Osmosis Stabilizer

Regular price $596.00 USD

Regular price ~~$1,012.20 USD~~ Sale price $596.00 USD
Unit price per

Sale
Chemboys pH Up Max

Sale

Chemboys pH Up Max

Regular price $56.00 USD

Regular price ~~$60.99 USD~~ Sale price $56.00 USD
Unit price per

Sale
Chemboys pH Down Max

Sale

Chemboys pH Down Max

Regular price $56.00 USD

Regular price ~~$60.99 USD~~ Sale price $56.00 USD
Unit price per

Sale
Athena Pro Balance

Sale

Athena Pro Balance

Regular price From $77.00 USD

Regular price ~~$110.00 USD~~ Sale price From $77.00 USD
Unit price per

Sale
Hanna GroLine pH 7.01 Solution

Hanna GroLine pH 7.01 Solution

Regular price From $3.00 USD

Regular price ~~$3.00 USD~~ Sale price From $3.00 USD
Unit price per
Hanna GroLine pH 4.01 Solution

Hanna GroLine pH 4.01 Solution

Regular price From $3.00 USD

Regular price ~~$3.00 USD~~ Sale price From $3.00 USD
Unit price per
Hanna GroLine Storage Solution

Hanna GroLine Storage Solution

Regular price From $20.00 USD

Regular price ~~$20.00 USD~~ Sale price From $20.00 USD
Unit price per

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