[2 Pack] DC 6-30V Timer Relay Programmable Delay Relay Module Cycle Timer with LCD Display / 5V Micro USB, Smart Home Controller
【Multifunction Timer Relay】Programmable delay modes to control the relay timings, widely used at smart home, industrial control, automatic irrigation, indoor ventilation, protection equipment etc..
【Load Range】Operating voltage: DC 6V - 30V, support micro USB 5V power supply. High level trigger: 3V - 24V. NO(Normally open) maximum load < AC 250V/10A, < DC 30V/10A. Timing range: 0.1s ~ 999mins (continuously adjustable)..
【Reverse Protection】Built-in a diode to provide protection against accidental reverse polarity for the circuits..
【Sleep Mode】If no operation within 5 minutes, the digital tube of the relay board will turn off automatically. Pressing any button can wake it up..
【Parameter Setting】OP(conduction time) / CL(off time) / LOP(circuit times) can be set individually, and the parameters are mutually independent. All parameters are permanently saved once set. The functions and parameters can be reviewed or changed at a later time..
API SALTWATER MASTER TEST KIT 550-Test Saltwater Aquarium Water Test Kit
Contains one (1) API SALTWATER MASTER TEST KIT 550-Test Saltwater Aquarium Water Test Kit, including 6 bottles of testing solution, 1 color card and 4 glass test tubes with cap.
Helps prevent invisible water problems that can be harmful to fish and cause fish loss.
Accurately monitors 4 most vital water parameters levels in saltwater aquariums: high range pH, ammonia, nitrite and nitrate.
Use for weekly monitoring and when water or fish problems appear.