Having acquired this item, I'm not disappointed in the quality of the optical microscope. Its well high price can not exempt him extreme manufacture of this product. This is serious! A truly robust laboratory tool and having all the skills required of the leading brands. It is modular with optional phase contrast set and black dry or oil bath. In short, it trinocular offers multiple functions of optical complement ... L'ABBE capacitor has a blue glass door provides (optional yellow, green, white and frosted) and a diaphragm.