I have 2 hives at my place at the moment. One has a Freeman beetle trap(SBB and oil tray) the other has no trap. The hive with the Freeman trap has zero beetles crawling around (I know this because we did a full inspection on it today) but has a few beetles in the trap every now and then. The hive with out a trap has dozens of beetles crawling around. I am very happy with the Freeman trap and will be using them on all my hives.
Is this the one you're talking about Shane? freemanbeetletrapDOT