pen shape design,convenient to carry and field test.Stable power output,low power,outstanding performance.CW and glint mode switchable,aluminum alloy enclosure. Easy identification of fiber break,bend,you can protect the fiber layer Widely used infiber optic transmission,network maintenance and optical fiber test instruments. This visual fault locator is used to check fiber breakage,bending failure location. Colour: Black Material: plastic +metal Size: 19.5 x 7 x 3cm Package Contents: 20 x Visual fault locator 20 x Portable strap 20 x User manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.