The SM/PL Series of Precision Loads is created by Anritsu. This series has four models with varying specifications. Each model has similar specifications; the only differences are the frequency ranges and connector types. The SM/PL and SM/PLNF have a frequency range from DC to 4 GHz, while the SM/PL-1 and SM/PLNF-1 have a frequency range from DC to 6 GHz. The SM/PL and SM/PL-1 have an N male connector, whereas the SM/PLNF and SM/PLNF-1 have an N female connector. Every Precision Load in the SM/PL Series has a DC resistance of 50 ± 0.25 Ohm, and return loss of 42 dB.
