Bright a clear LED noid light for automotive electronic diagnostics 4 mm female “banana” type sockets allow the back probes to be used on any multi-meter leads equipped with 4 mm male “banana” plugs. Easy fit fine back probe pins offer universal connectivity Used to “see” the switching of low tension circuits like petrol injectors, ignition LT circuits and relay switching circuits. Do not use on high voltage diesel injectors. Only connect in parallel, connection in series will result in damage to the Noid light