WaterLink 3 x 3 Multi Use Spin Disk 501 50/box

Waterlink Spin Disks
10 Test Parameter Disk Series
Four different Spin Disks Ideal for Service, In-Store, and Public Pool Testing.

Free & Total Chlorine & pH 3-Use WaterLink® Spin Disk 501 Series​
Ideal for Public and commercial Pools testing Chlorine and pH throughout the day.
Test Free Chlorine, Total Chlorine (Bromine), Combined Chlorine (calculated), and pH in 30 Seconds!
Save money by using the same disk 3 times. Meter knows which test section is new test