General Tools MMH800 4-In-1 Combo Moisture Meter, Pin Type or Pinless, Temperature and Humidity, Dual LCD Displays, Audible Alarm PIN OR PINLESS- Pin type for precisely measuring moisture in materials and flat surface (non-intrusive) dual pad sensors to detect general areas of moisture TWO DISPLAYS- Moisture percentage and ambient temperature plus relative humidity HOLDS READINGS- Holds moisture level readings for convenient viewing later AUDIBLE ALARM- High/medium/low audible indication of moisture level INCLUDES- 9V battery, lanyard, 2 sets of spare pins, users manual