PerkinElmer Instruments offers a universal counter with a USB connection that works with laptops and PCs. The Sense-ations 3820 measures frequency, average period, duty cycle, pulse-high and -low times, and logic state. It also counts random or periodic pulses. Measured values are sampled at intervals ranging from 50 ms to 1 s, and all of the data are streamed to hard disk for analysis. The universal counter is available with standard applications software that provides accurate measurements and includes a programmer's toolkit for integration into a measurement system.