MrYeats,
Several manufacturers make chronographs (the name for an instrument to measure the speed of a bullet). You can purchase them through a local gun store, mail order through several companies (Cabela's, Dillon Precision, Midway are three that come to mind) or buy direct from several firms (Oehler Research, Competition Electronics, Shooting Chrony. PACT) Do a search on the Internet for bullet chronograph and you should find several sources. Expect to pay at least $85 for a low-end but perfectly adequate one (ProChrono by Competition Elect., Shooting Chrony) and up to several hundred dollars for a high-end unit such as Oehler's.
Wayne