You only need the contact from the MC-7825S with the material which should be measured. The gauge is equipped with a very compact and strainable housing, which is easily to transport and serve and is delivered with a practical carrying case.Applications: Digital hygrometer for the precision measurement of concrete, floor, pavement, wood, wood fiber, tobacco, cotton, paper etc. Suitable for: Building and construction industry, wood industry, woodworking enterprises, architect, consultant, expert, housebuilding enter-prise, painter, interior from farmer, carpenter, parquet publisher, building firms, housing managements. Scope of supply: - Measuring instrument - High-quality transport case - Manual. 4x 1.5 AAA Batteries. Temperature: 0-50 °C Air humidity: max. 165mm x 62mm x 26mm.