You can turn the frame with the grabber- but it is awkward and hard to then tilt it. The one I have doesn’t have a lock so you need to keep pressure on the handles or you will drop the frame. If you turn the frame your hand is all twisted up… The best way to use a grabber is to remove a frame- then hang in on one of those frame rests that you can hang off the side of the hive. then you can put down the grabber, pick up the frame with both hands and examine as usual. I like the frame rest as I can remove one frame and hang it outside the hive- giving me room to manipulate the other frames. I prefer that to resting the frame on the ground or whatever.
I know Jeff has no use or need for all these gizmos…
I think the grabbers are probably good for beginners, as they make it easy to lift out a frame nice and evenly without rolling the bees- also good for lifting delicate new comb. But nothing beats having two hands on the frame for manipulating it to look for eggs etc.