The higher the quality of the sections, the more careful the diagnosis.
Microtomes are used for sectioning the tissue blocks. Microtomes were just mechanical devices in the past for which it was very important for the operator to be enough qualified and experienced to get the high quality sections worth for careful diagnosis.
Fortunately the technology improvement has led to the production of the semi and fully automatic microtomes and the purchasers can choose the right microtome from the variety of the types of microtomes.
Also, in past just the knives were used on the microtomes for sectioning but nowadays as it is so hard to sharpen the knives, they are replaced by the disposable blades gradually. The microtomes can be presented to the customers by either disposable blades or knives holders on their demand.