The MMD900 is a dual type moisture meter with both pin-type and pinless measurement capabilities. The two measurement modes are %WME (pin) and REL (pinless). The pinless measuring is up to 2 in. deep via a sensor on back of meter The unit has a Jumbo LCD and 40-dot LED bar graph dual display. Ideal for contractors, woodworkers and homeowners to find leaks and to measure the moisture content of wood and other construction materials.