Easy to use technology that is designed to be used in dental practices. The convenient is a self-contained paddle tester that is individually packaged, sterilized, and ready to use. The HPC DUWL sampler includes: A plastic paddle, an air vent on the back of the paddle, a membrane filter, a plastic case for sampling and incubating, instructions for use, and a sample log. • Easy to use • Results in 48-72 hours • Provides an estimated HPC bacteria number The screens dental unit waterlines for bacteria and provides an estimated heterotrophic plate count (HPC) number to confirm compliance with the CDC & EPA guidelines of ≤500CFU/mL.