The Femtometer™ is a Michelson interferometer-based autocorrelator, combined with high quality computerized data acquisition, processing and evaluation software, developed for ultrashort pulse characterization. It consists of a compact interferometer head, a spectrometer and a controller interface. Femtometer is the only computerized pulse characterization tool that provides access to the time scale of the light oscillation period allowing the measurements of few-cycle pulses.