MFJ-817 144/440 MHz PEAK READING SWR/WATTMETER utilizes a crossneedle meter so that the peak or average power forward and the SWR can be read simultaneously. This unit is designed to operate at the 144 and 440 MHz bands. Power readings are made on two different scales. The low scale reads from 0 to 20 watts forward power and from 0 to 5 watts reflected power and 0 to 50 watts forward power and 0 to 50 watts reflected power. SWR is read from 1:1 to 5:1
$45
Manual: https://www.mods.dk/_34maNUals3487det/mfj/MFJ-817_Manual.pdf