Lovibond DPD 1 HR Tablets for Use with SC450 chlorine 2 and 3 colorimeters, MC500 colorimeter, SP600 spectrophotometer, AquaPRO3 and PRO6 Pool photometers Overview - Lovibond DPD 1 High Range Tablets - Suitable for Lovibond photometers - These Tablets are able to test for high range free chlorine. Water analysis couldnt be easier. Precise dosing, long shelf life and easy handling make the tablet reagent the most popular indicator system and the cheapest way to analyse a parameter. The tablet reagent in the aluminium blister pack withstands almost all climatic conditions and external influences. In addition, there is no safety risk for the user.