Relay tester circuits?
Answer:
Coto is a manufacturer and not a relay type.
On this website alone, there are 24 different "Coto Relays": http://us.100y.com.tw/viewmanufacturer.a...
Choose the one you have, click on its data sheet and simulate its intended operation, using an appropriate power supply for the coil and an Ohm Meter for the contact(s).
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