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Features: – VSWR. Forward and reflected power direct digital readout, without any calibration. -Max. measurable power range up to 100W. – 3 seconds check your antenna SWR, also check your radio RF power watt. – Easy to install handheld Radio Specifications: – Measurable power range: 0.1-100W – Max. power: 100W Accuracy: mean + / – 5% * Not for the DMR digital radio. – MAX. Power in: 100W – V.S.W.R: 1.00~19.99 – Frequency Range: COVER – 125MHz~525MHz – Insertion Loss: – Temperature: 0â~70â – Battery Built-in: Li-ion Battery – Size:(WHIT OUT SMA): 25*25*60 (mm) – Power in: 5V (micro usb) – Interface (in and out ): SMA female – Impedance: 50Î© – Weight: 160gã Features function Push red button and hold 3 sec.to’ Power on ‘ and ‘SWR ‘mode ‘ Push red button -‘ Power Meter ‘mode Push red button -‘ SWR ‘mode Push red button and HOLD -‘ POWER OFF How to use Power meter Push red button -switch on Push red button at once to mode ‘POWER meter ‘ Connect the SMA (mark TX) to Radio output . Connect the SMA to DUMMUY Load Caution: Please use correct dummy load, High power will damage the dummy load. How to use SWR meter Push red button -‘ Power on ‘ and ‘SWR ‘mode Connect the SMA (mark TX) to Radio output . Connect the SMA to ANTENNA When the the led show 1.00 to 1.50 , mean the antenna is suit the frequency, When the the led show 1.50 to 3.00 â , mean the antenna is not good suit the frequency, When the the led show up to 5.0 to 19.99â , mean the antenna is not suit the frequency. Package includes: 1 x Surecom SW-33 Mark II 1 x SMA Dummy Loads 1 x English Manual 1 x USB Charge Cable 1 x USB AC Adapter 00-240V