Features: The opticals Power Meter integrates three essential functions opticals power measurement, light source, and networking cable testing into 1 device, eliminating the need for multiple tool in fiber opticals networking maintenance. Featuring broad measurement ranges from 70dBm to +10dBm with laboratory accuracy, this ABS+metal hybrids tool delivers performances for precise signals strength evaluations in diverse networking environments. for professional networking technicians, telecoms engineers, and IT infrastructure specialists requiring portable solution for field operations and equipment diagnostics. for rapid troubleshooting during fiber opticals installations, data center maintenance, or enterprises networking upgrades where space constrained worksites demand lightweight, pocket sized test equipment. Its intuitives interfaces paired with auto shutdown functionality ensures extended battery life and seamless operations during extended field deployments, while the construction withstands daily professional use. Specifications: Materials: ABS+metal Size: 111x69x30mm Power supply: 2 AA dry batteries (need to bring your own) Package Includes: 1Set opticals Power Meter note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.