HI701-11 is a high-quality set of calibration standards that allows users to validate the Free Chlorine Checker. The calibration check set includes one sealed cuvette for zero ppm free chlorine and one cuvette that is tinted to an equivalent 1.00 +/- 0.05 ppm free chlorine sample @ 25°C. 
 
	
Supplied with Certificate of Analysis
	
Reusable with long shelf life stability