The Milwaukee MW11 Total Chlorine Photometer lets you go digital with your testing

Ideal for those requiring an accurate alkaline reading

and HI9811-5 portable multiparameter meters

or RO water (will damage probe sensitivity)

Hanna Free and Total Chlorine CAL Check Standards - HI93414-11 858502005111 The Milwaukee MW11 Total ChlorineThe HI93414 11 Free and Total Chlorine CAL Check Standards provide a simple solution to calibrating and validating compatible benchtop and portable photometers. This high quality set of standards is manufactured in our state of the art facility and comes supplied with a certificate of analysis. The certificate of analysis provides the lot number, reference values, and expiration date for traceability when certifying compatible free and total chlorine