Total Chlorine Reagents (Qty 1 Box of 25 reagents) Part # HI711-25

Works as intended. I have a salt chlorinator this helps keep adjust it to get the Chlorine under 2PPM. If you have too much Chlorine, it will error out since it it reads a maximum of 3.5 PPM. If it errors out dilute the test sample with 50% bottled water and multiply by 2 the test result. Nice accurate gadget.