Calibration & Reference Solutions

General Hydroponics pH Control Kit contains 8 oz pH UP, 8 oz pH DOWN, 1 oz indicator and vial. Testing your solution takes just a few moments. Star...

Calibration and conductivity standard solutions... a must in every grower's toolbox. The Bluelab calibration and conductivity standard solutions ar...

Calibration and conductivity standard solutions... a must in every grower's toolbox. The Bluelab calibration and conductivity standard solutions ar...

This Base solution is formulated using potassium hydroxide and potassium carbonate. Add a little at a time when your nutrient pH is too low in orde...

A consistent pH is one of the most important elements in maintaining a healthy garden. Make sure your plants work at an optimal pH level with Mad F...

pH-Up 0-0-5 is a Dyna-Gro product used to raise the pH of water.What is pH? pH is a measure of acidity or alkalinity. For growing in soil, the p...

pH-Down 1-5-0 is a Dyna-Gro product used to lower the pH of water.What is pH? pH is a measure of acidity or alkalinity. For growing in soil, the p...

All-in-one maintanence kit provides everything you need to maintain, clean and store your GroStar pH probe Kit Includes:  3M KCL storage solution ...

GroStar by Apera EC Calibration Kit (2.77 EC, 8 oz. each) • 2.77 EC conductivity standard calibration solution• Used as a reference or checking sol...

For use with HM Digital's PH-200 and PH-80 (as well as other brands of pH meters). Always make sure your sensor is kept in an electrode storage sol...

CYCO pH Down lowers the total pH value of the made nutrient solution.

"The 2.77EC solution is used as a reference or checking solution to ensure you have adequately cleaned the EC/ppm probe. Calibration Solution shoul...

The instrument is only as accurate as the probe is clean. Probe cleaning is one of the most important parts of owning or operating any Bluelab mete...

Everything you need to clean, hydrate and calibrate pH probes as well as clean and test conductivity (ppm/EC) probes. The instrument is only as acc...

GroStar by Apera pH calibration kit (pH 4/7/10, 8 oz. each) Kit Includes: (1) pH 4.0 calibration solution 8 oz. (1) pH 7.0 calibration solution 8 o...

GroStar by Apera pH calibration kit (pH 4/7, 8 oz. each) Kit includes:  (1) 8 oz. pH 4.0 calibration solution (1) 8 oz. pH 7.0 calibration solutio...

Mad Farmer’s Get Down is specifically designed to lower pH levels in liquid nutrient solutions. It is compatible with all brands of nutrients, orga...

Mad Farmer’s Get Up is specifically designed to raise the pH levels of liquid nutrients solutions. The Mad Farmer’s Get Up contains only the finest...

Hades Down is a pH adjusting liquid used to lower the pH of your nutrient solution. Hades Down chelates elements in the nutrient solution into stab...

Olympus Up is the Nectar for the Gods pH up product. Most gardeners know to adjust the pH of their nutrient solution before use. By using liquid ca...

CES pH Up™Concentrated pH adjustment liquid, alkaline buffer raises water and nutrient solution pH. Highly concentrated, use conservatively. Slowly...

Keep your nutrient solution in the sweet spot with Emerald Harvest® pH Up. A pH reading below 5.5 is considered too acidic for most hydroponic gard...

General Hydroponics pH Test Kits make pH testing easy. Simply fill a test-tube halfway with nutrient, add a few drops of pH Test Indicator and obse...