If you want to use your original European strobe platter to check speed here in the States, there is a battery powered strobe light that is made to work with the 50Hz Garrard platter.
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Look here: Keystrobe Turntable Essentials
These folks make a replacement strobe and pulsar unit for Garrard 301, 401 and 124 decks that negates the need for frequency-specific platters. They seem to be reasonably priced as well. I am contemplating a 401 rebuild project and I plan to use this unit.