*Accurate test, fine workmanship, easy to carry, completely replace optical power meter *In the era of high bandwidth, reliable fiber optic power equipment is particularly important. This handheld photometer can help check cable performance, calculate relative power loss, locate faults, and troubleshoot. *Measure the length of network cables, coaxial cables, and telephone cables. Able to test open, short, cross-connect., Manufacturer: ZXZZAS