Unfortunately, the only other RD I have at this moment is my old Bel 715i. I went back to test against the sign, though, and the sign had been moved already.

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Whistler Pro-78 Rev C3, Hard-Wired Above RVM
Saves: 11 for >$1500, Tickets: 1 for $87 (User Error)
Long Detects: Ka 3.5, K 3.1