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RF433 Transmitter to synchronize sensors


There are N Fezs, all connect with sensor and RF433 receiver.
I want use an additional Fez and a RF433 Transmitter to send a signal to all FEZ. I want trigger sensors start sensing simultaneously. Does the synchronization error can less than 1 ms? The Xbee seems can’t do the micro second synchronization. So I think many simple RF can do that? Any good suggestion? Or does anyone can recommend me better devices?
Thank you very much.