This Standard validates the calibration of the HI 713 Phosphate Checker HC Colorimeter.
(2)Standards (1) 0.00 and (1) 1.00 ppm phosphate
Liquid Reagents for Alkalinity Checker HC Liquid Reagents for 25 Alkalinity Tests
Thank you so much for your help. Can't wait to get it in place. Once again thanks for not giving up on it. I shall sing your praises to everyone I come in contact with regarding saltwater equiptment.