Abstract: A self-contained, single-unit test and calibration unit for Doppler-effect speed measurement devices (radar guns, etc.) is provided. The inventive unit is capable of performing manual, semi-automatic and automatic measurements on radar guns insuring no "missed" steps in the certification process. The unit is optionally supported by a general-purpose, digital computer such as a "PC" which may, in turn, be linked to a remote facility via modem or similar communication strategy. Either a local or a remote computer may oversee the test, calibration and certification processes. The inventive unit allows for fast and accurate certification of radar guns in the field by operators of only minimal technical skill thereby saving expense and time as radar guns no longer must be shipped to a remote certification facility.