1pc 3-in-1 Fiber Optic Wire Stripper, Three-port Miller Pliers, Fiber Optic Wire Stripper, Double-port Multi-functional Leather Wire Pliers, Professional Grade Stripper Pliers, PML-31pc 3 in 1 Fiber Optic Wire Stripper, Three port Miller Pliers, Fiber Optic Wire Stripper, Double port Multi functional Leather Wire Pliers, Professional Grade Stripper Pliers, PML 3 Function: can measure 8 standdard wavelengths 850 980 1300 1310 1490 1550 1625 1650nm , test range: 70dBm~+10dBm; 10MW red light source can measure the distance is about 10 15 kilometers. It can work for 40 hours with 2 AA Batteries(Not Included), the batteries are