4410 Series high-sensitivity wattmeters are solid choices for field-service applications where the greater dynamic range of the plug-in elements substantially reduces the number of elements needed to cover multiple power and frequency ranges. The 4410 series is also well-suited to laboratory work where power levels as low as 2 milliwatts must be measured with high accuracy. 

Each 4410 Series wattmeter plug-in element is capable of reading seven different power ranges covering 0.002* to 10,000 watts. The power ranges of the different elements overlap and include: 0.002–10 W, 0.02–100 W, 0.2–1000 W and 2–10,000 W. All ranges are in frequency bands from 200 kHz to 2300 MHz. Any one of the seven power ranges is selected by a rotary switch located on the front of the wattmeter. Forward and reflected power measurements are accomplished by rotating the element. 

Exceptional ±5% of reading accuracy is achieved via a built-in temperature compensation circuit. This stated accuracy applies from 100% of full scale down to 20% of full scale across all seven ranges. 

The 4410A is powered by a standard 9-volt alkaline, transistor radio type battery and has a minimum battery life of 24 hrs.