The 3 mL syringe is used to fill the disk with the sample water. When the syringe is placed in the pool or spa sample, and the plunger is pulled all the way up, the syringe will hold more than enough sample water to adequately fill the disk. The syringe is held vertically and the tip is inserted into the fill hole on the disk. The plunger is pressed slowly and smoothly to fill the disk.
3 x Syringes
Does not include discs