The 918D-IR-OD1R Germanium Photodetector is designed for low optical power measurements. It features include integrated calibration-data storage, built-in OD1 attenuation filter with automatic On/Off detection, temperature sensing electronics for temperature drift compensation and is compatible with DB15 based Newport Power Meters. The Germanium (Ge) photodetector is NIST-traceable calibrated for 780-1800 nm optical power measurements. It includes a certificate of calibration with calibration curves and data for both attenuator on and off conditions.