Test tool

The utility model discloses a test tool, including base plate, mounting seat, light barrier and power analyzer, mounting seat and light barrier both slide on the base plate along the first direction, laser output head is fixed on mounting seat, the light barrier is equipped with light through hole, the power analyzer is equipped with light inlet hole. When the laser output head emits laser towards the light barrier in the first direction, the laser in the area where the light through hole is located passes through the light through hole and enters the power analyzer from the light inlet hole, and the laser outside the area where the light through hole is located is blocked by the light barrier. By adjusting the positions of the light barrier and the mounting seat along the first direction, the data of the power analyzer at different positions of the light barrier and the mounting seat are obtained, and the proportion of invalid laser such as cladding light in the laser output by the laser output head can be o