HID Hut now offers the Tongdy 3003D Complete Greenhouse Controller, which offers excellent functionality and compact size. The controller size is less than 4" x 3" x 2" and it reads CO2 levels, temperature, and humidity. The 3003D also has three fully programmable (with hysteresis) 120V outputs and senses light intensity through a photo eye which turn off all CO2 devices automatically at night. This patented system allows it to be used continually for a period of 15 years without recalibration. The 3003D is a wall mountable unit which has three dry contact outputs that will control a CO2 device, temperature devices, and humidity devices. This meter wires up exactly like an air conditioning thermostat, with 3A of 120V switching current on each of the 3 outputs (configurable for CO2, Humidity and or Temperature). Input power is 120V which must be hard-wired to the meter. For a plug and grow unit please see the Tongdy 5203S which comes wired with 120V plugs and can handle 20A. It carries a full coverage two year warranty. For more information call 866.678.8565 or visit www.hidhut.com.