Onyehn 1 Channel DC 3V Relay High Level Driver Module Optocoupler Relay Module Isolated Drive Control Board for Arduino (Pack of 5) auspowers_batchthree You can add or remove

You can add or remove channels from the scanning list to scan only the channels you want to monitor

Please also understand that a big obvious switch or else people will know it looks fake

and industrial use

Hard-to-Find Fastener 014973294786 Pushnut Bolt Retainer

Syringe filters [Wettability: Hydrophilic Nylon Membrane]

Onyehn 1 Channel DC 3V Relay High Level Driver Module Optocoupler Relay Module Isolated Drive Control Board for Arduino (Pack of 5) auspowers_batchthree You can add or removeOnyehn 1 Channel DC 3V Relay High Level Driver Module Optocoupler Relay Module Isolated Drive Control Board for Arduino (Pack of 5) Size: 70mm X17mm X20mm (LxWxH) Main chip: EL817, SRD DC03V SL C Work voltage: DC 3V 3. 3V Control 10A 250VAC, 10A 30VDC load Features Instructions with the signal output Signal input port can connect microcontroller IO port, high level signal Double power selection design anti interference ability is strong, photoelectric