1 card contains 10 tablets DPD No. 1.
Test tablet DPD No. 1 is used to measure free chlorine in pools and spas. Can be used with both Scuba II and SmartTest.
If you also need pHenol Red to measure on: Click here!
Need to refill with test tablets for Cyanuric Acid, Alkanity and Total Chlorine you will find them in our refill pack: here