A Barnstead-type table model water still is a laboratory or industrial device for purifying water, typically featuring stainless steel construction and a double-walled design for energy efficiency. It works by first preheating raw water in the condenser, which is then heated in the evaporator to produce steam, leaving behind impurities. Key specifications vary by model but often include an electrical power of 220-240V, a capacity ranging from 1-10+ liters per hour, and applications in scientific and pharmaceutical industries.