Elan-USBcount 50-50 M Hz-Frequency-Period-Counter-Elan-USBCOUNT50-P-The-B-USBcount 50-B-is-a-PC-based-isolated-frequency-period-counter-that-uses-its-small-size-USB (Universal Serial Bus)-connectivity-&-high-performance-to-give-a-unit-that-is-flexible-easy-to-use-&-economical-The-unit-has-been-designed-to-allow-the-measurement-of-a-broad-range-of-frequencies-&-pulses-P-P-With-a-feature-set-normally-associated-with-much-larger-&-more-expensive-bench-instruments-it-is-an-ideal-instrument-for-use-durin