TechGrow’s T‑Mini Pro is a compact, all‑in‑one CO2 controller for indoor gardens and greenhouses. It measures and displays CO2 concentration, air temperature and relative humidity, updating once per second, and records min/max values. An internal NDIR CO2 sensor and a built‑in light sensor enable automatic day/night switching; night dosing can be disabled or overridden for 24/7 dosing. The unit controls a CO2 source via an 8 A relay and accepts 100–240 V input power. Setpoint range is 300–2000 ppm. A small fan provides constant airflow across the sensors for fast response. The 2×16 character display and single‑knob interface simplify setup. Dimensions are 18 × 13 × 12 cm; weight 760 g; memory retains setpoint and hysteresis after power loss.