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.
The Bird 43 Series continues to serve as the benchmark for RF power measurement in field service, manufacturing, maintenance, and military applications worldwide.
As RF technology has evolved, Bird has expanded its wattmeter portfolio to address newer measurement requirements, including digitally modulated signals, return loss testing, and element-free operation.
Whether you rely on the proven Bird 43 Series or require advanced digital measurement capabilities, Bird offers a wattmeter designed for your application.
From routine maintenance to precision tuning, there’s a 43 Series model built to match your workflow. Use the table below to compare features and choose the best fit.
Frequency Range Note:
Some Bird wattmeters may operate down to 450 kHz when used with compatible legacy low-frequency elements. These low-frequency elements are no longer part of Bird’s current standard offering. For currently available elements, the low-frequency limit is 2 MHz.
Applies to: 4391A, 43, 43P, 3128A, 3170B, 4314C, 4431, 4521, 4522, and 4526.
Keeping equipment calibrated is the number one way to ensure performance and longevity. A Bird Calibration means we fully test your equipment and adjust it as needed to ensure it’s meeting specs.
Bird wattmeters are the standard for accurate, durable RF power measurement. From analog tools to peak power models, professionals trust Bird when it has to work—every time.
Proven Wattmeters. Trusted Results.