NISSEL RS-40 Dual Band Standing-Wave Meter Power Meter SWR Meter for Testing SWR Power 100% brand new and high quality. 100% authentic manufactured. Measurement accuracy is between  5 to 10% depending on model Measurement accuracy is between  5 to 10% depending on model. Insertion loss is typically less than 0.3 dB or lower. Maximum measurable power range up to 200W.