Mat-Tuner mAT-S1500 1.8-54MHZ 1500W  4.3inch LCD Digital Standing Wave Meter SWR RF Power Meter For Shortwave Radio 4.3inch LCD with backlight Power measurement range： 1-1500W Brand: MAT-TUNER Model: mAT-S1500 Frequency range: 1.8-54MHz Power measurement range: 1-1 500W Power accuracy: /-5% (7MHz) Interface: SO-239 (M Female) Measurement range of standing wave ratio: 1.00-9.99 Standing wave ratio accuracy: /-3% (1.8-54MHz) Impedance: 50 ohms Instructions for use Connect the RF IN interface to the radio station, and the RF OUT interface to the antenna or dummy load. Do not reverse connect. The power measurement range of the standing wave meter is 1-1500W. When the transmission power is less than 1W, the measured power will be displayed as “0(zero)”. Note: 1. Do not perform measurement operations during charging. 2. During use, the range can only be switched from low to high . To switch to a low gear, please restart the standing wave meter