Kenometer vs. Goniometer: How do they differ?

Both the Kenometer and the Goniometer measure the alpha and beta angles of drill core, but the Goniometer's generic size does not make it quite as accurate as the Kenometer.
The Kenometer is made in NQ2 and HQ sizes, specifically contoured to these core shapes. For this reason, its protractor measurements on the side are more accurate as they are closer to the original curve of the core than in the Goniometer.
Here are other reasons why the Kenometer is the preferred tool by most geologists:
1. Permanent markings ensuring reliability
The laser etching process during manufacture of the Kenometer ensures the markings are permanent, and can never be 'rubbed off'. The goniometer has its markings in ink on plastic, meaning they aren’t likely to remain visible in the field in comparison to the physical etchings on the Kenometer. The laser etching will remain easy to read even after many years of tough field use - this is a tool for life.
2. Tough anodised aluminum body
The aluminum body of the Kenometer gives the tool a fantastic strength-to-weight ratio, while the goniometer’s plastic construction is likely to suffer in field drops or in transit. The anodised coating is hard, durable, will never peel, and, under normal conditions, will never wear. The purpose of anodising is to form a layer of aluminum oxide that will protect the aluminum beneath it. The aluminum oxide layer has much higher corrosion and abrasion resistance than aluminium.
3. One process, two measurements design
The Kenometer was designed to take both alpha (structure) and beta (rotational) measurements simultaneously. Once the core is properly aligned in the tool, the user can take both the alpha and beta angles at the same time.