The Extech MO230 Pocket Moisture Meter displays moisture in wood and other building materials plus air temperature and relative humidity. The MO230 features a Simultaneous digital readout of moisture content plus ambient temperature or humidity with analog bargraph display of moisture, Max moisture values, and programmable wet/dry indication. It also has a memory that contains 3 wood groups and 4 building material groups with calibrations for approximately 150 species of wood and 19 building material types.