Palintest Photometer DPD No 1 Rapid Dissolve Test Tablets these should be used with Pooltester instruments and will test Free Chlorine from 0 - 5.0 ppm (mg/l)
 
Made in the UK these Test Tablets are considered to be the best available on the market.
 
Storage & Handling
Store in a cool, dry place away from oxidizing and reducing agents, strong acid, alkalis, solvents and organic materials.
Do not mix with other chemicals.
Always wear suitable gloves and eye protection when handling.
Use biocides safely. Always read the label and product information before use.