Gavita Master EL2 Gen 2 bulbs Temperature Device Station（DST 1） The TrolMaster 7692 Temperature Device Station（DST 1） The TrolMaster DST 1 Temperature control modules allow the user to easily connect and control standard heating or cooling devices to the Hydro x Optimum nutrient absorption is aided by natural humic extracts for increased quality and superb yields High temperature dimming and safety feature shut off Event logging Independent sunrise and sunset settings Independent light cycles and Programmable External Contactor Modules (ECMs) on the EL2 The Gavita Master Controller EL1 and EL2 are entry level systems for centrally controlling large rooms with e series fixtures