The ET-5000 series 2-μm photodetectors manufactured by Electro-Optics Technology Inc. feature rise and fall times of <35 ps and a cutoff frequency of >10 GHz. They have a spectral response range from 900 to 2200 nm and include an internal bias supply. Free-space and fiber-coupled models are offered. The InGaAs PIN detectors have a photodiode active area diameter of 60 μm and responsivity of 0.9 A/W at 2100 nm. Running on a 3-V battery, they enable monitoring of thulium and holmium lasers, and perform pulse width measurement of subnanosecond lasers.