Máy đo chiều dày lớp phủ sơn mạ Bristol model 157, model 137
The model 157 is the most precise, measuring thickness to an accuracy of ± 0.1 μm and a repeatability of ± 0.02 μm. For less exacting applications, the model 137 is a lower-priced alternative with an accuracy of ± 1 μm and a repeatability of ± 0.05 μm.