What are the differences between a Vickers hardness tester and a microhardness tester?

Taiwan Nakazawa Co., Ltd. answers for you regarding the magnification issue: Since the test force of a Vickers hardness tester ranges from several kilograms to dozens of kilograms, the test force load is relatively larger than the force value of a micro-hardness tester. For example, when measuring the same type of specimen, the indentation produced by a Vickers hardness tester is also relatively larger, and its magnification is generally suitable for observation and measurement at about 100x to 200x.
If a Vickers hardness tester were to use a magnification of 400x or higher, the produced indentation image would be too large and exceed the field of view of the eyepiece, making measurement impossible. Therefore, the commonly used magnifications for Vickers hardness testers are 200X or 100X.