Circuit tester

A circuit tester is a device which is plugged into an electrical socket to make sure it is wired properly. 
batteries circuit tester-test range：3-30V 
open short circuit testeropen short circuit tester-material：cellulose acetate fiber 
circuit resistance testercircuit resistance tester-probe：304 stainless steel 
LED digital display 
LED Indication: Green (-) / Red (+)