ORP correction buffer powder testing meter recalibration solution sachet
ORP (oxidation-reduction potential) correction powder buffer powder is a newly developed, simple to use buffer powder for ORP meter calibration and correction.  
Simply add the sachet contents into 50mL of distilled water at the temperature of 25 degrees.
Easy, sealed sachet with long life make these sachet perfect for leaving in your water testing or ORP toolkit.
Accuracy of solution is 256mV at 25 degrees Celsius