IceToolz "The Wat" Seat Tube Gauge

This seat tube gauge from IceToolz is the best way to determine the right seatpost size for your bicycle frame. No need for bulky callipers or cones. Once you've inserted the tapered stainless steel measuring tool vertically into the seat post, you can read the seat post diameter directly from the high-contrast scale. You can accurately measure to one tenth of a millimetre thanks to the marking that is just above the top edge of the seat tube. This clever tool by Ice Toolz should definitely be part of every good bike workshop.