Lovibond DPD No 1 Free Chlorine Tablets - 250

Certikin - DPD No 1 Chlorine Tablets | 250 Count for Photometer | Measures Chlorine, Bromine, Ozone | Long Shelf Life, Easy to Use | Suitable for Photometers, Multicoloured

Lovibond - Phenol Red pH Photometer Reagents | 250 Tablets | Easy Color Change for Accurate pH Testing, Multicoloured, Chemical Test Strip

Certikin - DPD No 3 Total Chlorine Tablets | Precise Dosing & Long Shelf Life | Photometer & Comparator Compatible | Eco-Friendly Chemistry | High Accuracy, Multicoloured, 250 Pack