Aquamatic S320H Sampler, Suitable for Outdoor use ● No Sample Frost Protection ● Ambient range: -10°C to +50°C. Made for the most rugged environments you tame, this sampler is founded on the reliable Aquacell, but is encased in 304 Stainless Steel, Double Coated Galvanized Steel with a heavy duty White Polyester Powder Coated Case. The upper protection door keeps out the elements while the refrigeration assures your samples are consistently preserved. The EPA has preferred vacuum for years, and no wonder. With high velocity horizontal transport rates and consistent volumes, Aquamatic samplers are the go to for your demanding sampling needs.