![Truing Caliper for Larger Movements (10444215183)](http://perrinwatchparts.com/cdn/shop/products/Image-Coming-Soon_main_eba4486e-6803-4b40-8c93-71407667371e_300x300.jpg?v=1595350507)
Truing Caliper for Larger Movements Truing Caliper for Larger Movements is a "Bergeon" Swiss quality balance trung caliper. This is a light weight steel caliper with pivot protectors. For a watch to work properly, the balance wheel must run true to ensure proper timing in all positions.