Choosing the Best Counter Selecting which counter will best meet your needs is the fi rst step. There are several related products that perform a variety of tasks at various frequencies: • Universal counters Both frequency and time interval measurements, as well as a number of related parameters. • RF frequency counters Precise frequency measure- ments, up to 3 GHz and beyond. • Microwave frequency counters Precise frequency measurements, up to 40 GHz and beyond. • Time interval analyzers Optimized for precision time interval measurements. • Modulation domain analyzers Designed to show modulation quantities, such as frequency versus time, phase versus time, and time interval versus time.