https://www.lste.eu/en/pon/174-3334-fx81.html
FX81/FX81T 1G/10G/25G PON Optical Power Meter
Optical power meter for installation, service activation and troubleshooting of B/GPON, XG(S)-PON, 25G PON, EPON and 10G-EPON fiber networks.
ponopticalpowermeter