Trio Indo pH Calibration

Trio Indo pH Calibration 4.0 & 7.0 plus electrode storage solution (250 ml of each solution)

Accurate pH 7 and pH 4 reference standards with a bottle of electrode storage solution containing 3.3 mol/L potassium chloride (KCl)
Can be used with any brand of pH meter or pen
Perfect calibration solution for balancing the pH of fertilizer solutions for plants, aquariums, aquaponics and even swimming pools
Solutions are safe and individually packaged in bags for shipping
Made and supported in Canada