The MW401 is a compact Conductivity and TDS portable meter with faster micro processor. This handy and ergonomically designed portable meter is ideal for anyone working on a low budget and still requires fast and reliable measurements. This meter is suitable for a wide range of applications including educational and agriculture/horticulture as well as water and environmental analysis. This portable meter with automatic temperature compensation has a smaller ergonomic and lighter case design. Other features include 100-percent larger and easier to read LCD display and long battery life. Each meter is supplied complete with Conductivity/TDS probe with 1 meter cable calibration solution calibration screwdriver 9-Volt Battery. Comes with a factory warranty from Milwaukee.