Calibration & Cleaning Solutions

A clean probe is an accurate probe. Cleaning the probe surface removes dirt or contamination. After cleaning, calibration (for pH probes) or testing (for conductivity probes) is needed. Cleaning and calibrating at least monthly will help maintain accurate readings. Accurate readings simplify crop management and provide improved growth.

To view our selection of pH adjusters (pH up and pH down), click here.

1 - 41 of 41 items
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Bluelab Probe Care Kit - pH and Conductivity Bluelab pH 4.0 Calibration Solution 250 ml Bluelab pH 4.0 Calibration Solution 500 ml
Bluelab Probe Care Kit - pH and ConductivityBluelab pH 4.0 Calibration Solution 250 mlBluelab pH 4.0 Calibration Solution 500 ml

Everything you need to maintain your pH and ppm meters.

For calibrating pH meters.

For calibrating pH meters.

$22.95

$20.99

$8.19

$7.29

$10.95

$9.99

Bluelab pH 7.0 Calibration Solution 20 ml Bluelab pH 7.0 Calibration Solution 250 ml Bluelab pH 7.0 Calibration Solution 500 ml
Bluelab pH 7.0 Calibration Solution 20 ml packetBluelab pH 7.0 Calibration Solution 250 mlBluelab pH 7.0 Calibration Solution 500 ml

For calibrating pH meters.

For calibrating pH meters.

For calibrating pH meters.

$2.00

$1.79

$8.19

$7.29

$10.95

$9.99

Bluelab pH Probe KCI Storage Solution 100 ml Bluelab 2.77 EC Conductivity Solution 250 ml General Hydroponics pH 4.01 Calibration Solution 8 oz
Bluelab pH Probe KCI Storage Solution 100 mlBluelab 2.77 EC Conductivity Solution 250 mlGeneral Hydroponics pH 4.01 Calibration Solution 8 oz

Used to hydrate and store pH meters.

Used as a reference or checking solution to ensure proper operation and adequately cleaned EC/CF probe.

For calibrating pH meters.

$11.95

$10.89

$8.19

$7.49

$7.54

$7.19

General Hydroponics pH 4.01 Calibration Solution 1 qt General Hydroponics pH 7.0 Calibration Solution 1 qt General Hydroponics pH 7.0 Calibration Solution 8 oz
General Hydroponics pH 4.01 Calibration Solution 1 qtGeneral Hydroponics pH 7.0 Calibration Solution 1 qtGeneral Hydroponics pH 7.0 Calibration Solution 8 oz

For calibrating pH meters.

For calibrating pH meters.

For calibrating pH meters.

$21.50

$19.99

$21.50

$19.99

$7.54

$7.19

General Hydroponics 1500 ppm Calibration Solution 8 oz Hanna Instruments Cal Check Solution Hanna Instruments pH 4.01 Calibration Solution 20 mL
General Hydroponics 1500 ppm Calibration Solution 8 ozHanna Instruments Cal Check Solution, case of 25Hanna Instruments pH 4.01 Calibration Solution 20 mL packet

Used as a reference or checking solution to ensure proper operation and adequately cleaned EC/CF probe.

For use with HI98136

For calibrating pH meters.

$8.20

$7.49

$45.99

$34.99

$2.00

$1.89

Hanna Instruments pH 4.01 Calibration Solution 500 mL Hanna Instruments pH 7.01 Calibration Solution 20 mL Hanna Instruments pH 7.01 Calibration Solution 500 mL
Hanna Instruments pH 4.01 Calibration Solution 500 mLHanna Instruments pH 7.01 Calibration Solution 20 mL packetHanna Instruments pH 7.01 Calibration Solution 500 mL

For calibrating pH meters.

For calibrating pH meters.

For calibrating pH meters.

$19.95

$16.99

$2.00

$1.89

$19.95

$16.99

Hanna Instruments Storage Solution, 16 oz Hanna Instruments 12880 mS/cm EC Solution 20 mL Hanna Instruments 12880 mS/cm EC Solution 230 mL
Hanna Instruments Storage Solution, 16 ozHanna Instruments 12880 mS/cm EC Solution 20 mL, case of 25Hanna Instruments 12880 mS/cm EC Solution 230 mL

Used to hydrate and store pH meters.

Used as a reference or checking solution to ensure proper operation and adequately cleaned EC/CF probe.

Used as a reference or checking solution to ensure proper operation and adequately cleaned EC/CF probe.

$19.95

$16.99

$36.99

$27.99

$16.99

$14.99

Hanna Instruments 1413 mS/cm EC Solution 20 mL Hanna Instruments 1413 mS/cm EC Solution 230 mL Hanna Instruments 1382 ppm TDS Solution 20 mL
Hanna Instruments 1413 mS/cm EC Solution 20 mL, case of 25Hanna Instruments 1413 mS/cm EC Solution 230 mLHanna Instruments 1382 ppm TDS Solution 20 mL, case of 25

Used as a reference or checking solution to ensure proper operation and adequately cleaned EC/CF probe.

Used as a reference or checking solution to ensure proper operation and adequately cleaned EC/CF probe.

Used as a reference or checking solution to ensure proper operation and adequately cleaned EC/CF probe.

$36.99

$27.99

$16.95

$14.99

$36.99

$27.99

Hanna Instruments 1500 ppm TDS Solution 20 mL Hanna Instruments 1500 ppm TDS Solution 230 mL Hanna Instruments 1500 ppm TDS Solution 16 oz
Hanna Instruments 1500 ppm TDS Solution 20 mL, case of 25Hanna Instruments 1500 ppm TDS Solution 230 mLHanna Instruments 1500 ppm TDS Solution 16 oz

Used as a reference or checking solution to ensure proper operation and adequately cleaned EC/CF probe.

Used as a reference or checking solution to ensure proper operation and adequately cleaned EC/CF probe.

Used as a reference or checking solution to ensure proper operation and adequately cleaned EC/CF probe.

$36.99

$27.99

$15.95

$13.99

$19.95

$17.99

Hanna Instruments Electrode Cleaner 16 oz HM Digital 1000ppm Calibration Solution Milwaukee Instruments pH 4.01 Solution 20ml
Hanna Instruments Electrode Cleaner, 16 ozHM Digital 1000ppm Calibration SolutionMilwaukee Instruments pH 4.01 Solution 20ml, case of 25

General purpose electrode cleaner.

Used as a reference or checking solution to ensure proper operation and adequately cleaned EC/CF probe.

For calibrating pH meters.

$19.95

$17.99

$6.50

$5.99

$25.99

$19.99

Milwaukee Instruments pH 4.01 Solution, 220ml Milwaukee Instruments pH 7.0 Solution 20ml Milwaukee Instruments pH 7.0 Solution, 220ml
Milwaukee Instruments pH 4.01 Solution, 220mlMilwaukee Instruments pH 7.0 Solution 20ml, case of 25Milwaukee Instruments pH 7.0 Solution, 220ml

For calibrating pH meters.

For calibrating pH meters.

For calibrating pH meters.

$11.95

$10.99

$25.99

$19.99

$11.95

$10.99

Milwaukee Instruments EC Solution 1413 Milwaukee Instruments 1500 PPM Packet Milwaukee Instruments TDS Solution 1382 20 ml
Milwaukee Instruments EC Solution 1413, case of 25Milwaukee Instruments 1500 PPM PacketMilwaukee Instruments TDS Solution 1382 20 ml, case of 25

Used as a reference or checking solution to ensure proper operation and adequately cleaned EC/CF probe.

Used as a reference or checking solution to ensure proper operation and adequately cleaned EC/CF probe.

Used as a reference or checking solution to ensure proper operation and adequately cleaned EC/CF probe.

$25.99

$19.99

$25.99

$19.99

$25.99

$19.99

Milwaukee Instruments 1382 PPM Solution 220ml Oakton pH 4.01 Solution 20 ml Oakton Calibration Solution 15,000 uS 20 ml
Milwaukee Instruments 1382 PPM Solution 220mlOakton pH 4.01 Solution 20 ml Pouches, Case of 20Oakton Calibration Solution 15,000 uS 20 ml, case of 20

Used as a reference or checking solution to ensure proper operation and adequately cleaned EC/CF probe.

For calibrating pH meters.

Used as a reference or checking solution to ensure proper operation and adequately cleaned EC/CF probe.

$11.95

$10.99

$50.95

$43.99

$52.95

$44.99

Hydroponic Essentials pH 4.01 Calibration Solution 8oz Hydroponic Essentials pH 7.0 Calibration Solution 8oz
Hydroponic Essentials pH 4.01 Calibration Solution 8ozHydroponic Essentials pH 7.0 Calibration Solution 8oz

For calibrating pH meters.

For calibrating pH meters.

$7.95

$6.99

$7.95

$6.99

1 - 41 of 41 items