The DAFNE Beam Test Facility (BTF) is a beam transfer line optimized to produce single electrons and positrons mainly for high-energy detectors  calibration in the energy range between 50 and 750 MeV.

The BTF has been successfully commissioned in February 2002, and started operation in November of the same year.

Although the facility is optimized for single particle production it can provide electrons and positrons in a wide range of multiplicity, 1-10¹⁰ particle (50 Hz repetition rate, 10 ns pulses), requiring many
different diagnostic devices, from high-energy calorimeters and ionization/fluorescence chambers in the few particles range, to standard beam diagnostics systems.

The schemes of operation, the commissioning results, as well as the first users' experience are presented.