UEM63-4D R70 is a 4 DIN modules three-phase energy meter for the energy measurement in industrial and civilian application,with RS485 Modbus RTU/ASCII built-in communication. Available with MID certification suitable for billing. Keysight optical power meters measure optical signal strength, providing multi-channel measurement processing and system control while offering rapid response times, wide dynamic range, and simple integration into automated test setups. Our optical power meters feature built-in calibration factors. VIAVI offers fast, cost-effective, and easy-to-use power meters for installation and maintenance of single mode and multimode fiber optic networks and advanced, photonic-layer power meters for lab and production environments. The term usually refers to a device used for measuring the average power in fiber optic systems.