This is a knock off but essentially identical to the hornady comparator body. The original hornady is on the right in the uploaded photo and the "Bylot" comparator is on the left. Quality appears the same and works as advertised.
Pros
With its easy-to-use interface, the Bylot B2000 Comparator allows for precise and accurate measurements every time. This helps to minimize errors and to save time, making it an essential tool for those in need of precise measurements
Cons
User Interface: The user interface of the Bylot B2000 Comparator may not be intuitive to all users, making it difficult to use for those who are not familiar with the device. This may lead to errors or inaccuracies in measurements, which could be especially problematic in industries where precise measurements are critical