Omega 2500b Balance Adjusting Tool Omega 2500b Balance adjusting tool is a specialized tool for setting the balance wheel screws for Omega Caliber 2500b, with the movement inside the watch case. This balance adjusting tool is a Horotec product. Omega 2500b has different executions for it's balance wheel. This adjusting tool is for the Omega Caliber 2500b with micro-star shaped screws. These screws are adjustable and allow setting over a range of 52 seconds per day (version A) and 86 seconds per day (version B). When adjusting these balance wheel screws, it is vital to adjust each screw exactly the same. If you turn one screw only, you will cause and imbalance, which in turn will affect the performance of the watch movement in question. Supplied with instructions.