DPD Tablets,10grains per board for each PH & OTO tablets. in aluminium foil packing. Test for pool and spa water. Test Kit DPD Refill Tablets,10grains per board for each PH & OTO tabletsProduct Size(cm):10.5*5Product Weight (Kg):0.01Measurement:32*20*25cm Material/Remark: PH & OTO chemical tablets PH & OTO Test Tablets for pool & spa water