ProEdge dental unit waterline testing service - 4 Vials Kit. Provides third-party documentation of water quality based on heterotrophic plate counts. Results are reported in a pass/fail format based on the CDC's 500 CFU/mL standard and reported in a range of 100 to 20,000 CFU/mL. Kit Includes: Refrigerant pack, 4 collection vials, 1 Styrofoam mailer, All lab fees, Free Return Shipping. 4 vials kit