TechGrow’s T-1 Pro CO2 Controller is a dedicated regulator for greenhouses and indoor grow rooms. It measures CO2 via a remote TechGrow S-2 or S-4 sensor (sold separately) and controls enrichment through an 8 A relay. Setpoints cover 300–2,000 ppm, or 300–10,000 ppm when paired with a 0–10,000 ppm sensor. The controller logs the last seven days, features adjustable pulse dosing and a dosing delay, and auto day/night switching using the light sensor integrated in the CO2 probe. Its 4×20 character display refreshes every second and shows CO2 (plus temperature and humidity when using the S-4). Power input is 100–240 V, internal consumption 3 W. Box contents include the controller, 5 m UTP cable, mounting kit, spare fuse, and user manual.