The JDSU OLP15B is specially suited to measuring high power levels, such as those found in CATV systems, optical amplifiers (e.g. EDFA) and high-power lasers. The upper display limit for the OLP-15B is +20 dBm and for the OLP-18B +26 dBm. The lower limit of below -60 dBm means that the instruments are suitable for practically any application.