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SURECOM SW-33 markII 125-520 Mhz Mini Digital VHF/UHF Power & SWR Meter for Walkie Talkie for Two Way Radio Features:  1 VSWR. Forward  power direct digital readout, without any calibration. 2. Maximum measurable power range up to 100W. 3. 3 seconds check your antenna SWR , also check your radio RF power watt. ​4.Easy to install handheld Radio Specifications:  Measurable power range: 0.1-100W Maximum power: 100W Accuracy: mean / – 5% * Not for the DMR digital radio. Specifications: MAX. Power in：100 WATT V.S.W.R：1.00~19.99 Frequency Range：COVER:125MHz~525MHz Insertion Loss：< 0.15dB(VHF) , < 0.25dB(UHF) Temperature：0℃~70℃ Battery Build -in：Li-ion Battery Size(WHIT OUT SMA：25*25*60 (mm) Power  in：5V (micro usb) Interface (in and out )：SMA female Impedance: 50Ω Weight：160g Package Contents  1x SW-33 markII  SWR/POWER METER 1x English User Manual 1x USB charger cable 1x USB AC adapter 100-240V 1x SMA male to SMA male Adaptor ​1x SMA male to SMA female Adaptor 1x SMA female to BNC female Adaptor 1x SMA male to BNC male Adaptor 1x 5W DUMMY LOAD for testing / other type of 5W dummy load for testing (random)