This light source needs a FiberMaster tester, see 060-5931
Output power: -6 to -7dBm Typical
Connector: 2.5mm with ST, SC and FC adaptors
Power Supply: 3 x AAA batteries
Battery Life: 40 hours
Both 10mW & 30MW Visual Fault Finders are equipped with 2.5m universal adaptor which are used to test FC, SC or ST fibre cords However if you want to test LC or MU fibre cords then you would need this 1.25mm adaptor...