The Standard in RF Power Measurement - Built for dependable performance not lab-perfect specs Bird’s CW Wattmeters remain a trusted standard in RF testing. For over 70 years, Bird's 43 Series Wattmeters have defined what RF professionals expect from their tools: rugged reliability, field-ready simplicity, and precision you can trust under pressure. From military bases to broadcast towers, from mobile radio shops to industrial facilities the 43 Series is there, doing the work. Built around our field-proven Thruline design, these portable insertion-type wattmeters deliver direct, accurate measurement of forward and reflected RF power without complex setup or calibration. From analog tools to peak power models, professionals trust Bird when it has to work every time.