An indispensable tool for quickly identifying bending losses & breaks in optical fibres. In the case of too extreme bending or breaks in glass fibre cables the red laser light escapes at the bend/break of the cable. Problems in glass fibre lines of up to 3 km can be simply & easily localised. Blinking & continuous signal to increase the contrast & make it easier to localise the problem. Ceramic connections can be just as quickly & easily tested.