Fully functional, very clean, wired, plugs into a standard grounded outlet. Vaisala HMT337 Dewpoint & Temperature/Humidity transmitter with an internal Vaisala Power-1 power supply (120VAC to 24VDC) and digital display. Includes a temperature/humidity probe and user's guide (209 pages pdf). High quality, made in Finland. Pre-owned and tested industrial surplus from a closing plant in Quebec, Canada. Minor surface scratches only.