I checked mine today , parked my crown vic. beside the road and showed the wife how to lock the radar. Then I drove by at 55 mph. she locked it when I flashed my headlights. Found that the 95 mustang gt is off by 5 mph and the 72 c-10 is off 4 mph
55 on the speedo = 50 mph.
My suggestion is to just ask an officer to check you. I do it for people... sometimes when they ask sometimes not! LOL
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