TechGrow Humi Twin is a standalone humidity controller for grow rooms that runs either a humidifier or a dehumidifier via its built-in relay. A rear switch selects humidify or dehumidify mode. The target relative humidity is adjustable from 10% to 90% RH, and values are shown on a clear two-line LCD with status LEDs. Settings (setpoint and hysteresis) are stored and retained after power loss. The unit operates on 100–240 V AC, switches up to 8 A, and consumes about 3 W internally. A Temp/RH sensor is required but not included; the controller connects via a standard UTP cable. It ships with a 5 m cable, mounting kit and manual. Housing size is 18 × 7 × 13 cm; product weight about 590 g.