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A Standard Test for Sharpness How sharp is the edge That is both the most important question a sharpener can ask and possibly the hardest to answer. There are tests like cutting paper or shaving hair that are often used to demonstrate sharpness and they are helpful to a point but they lack the precision and standardization required to truly answer the question. However a precise and standardized testing method is available. It is achieved using the PT50 Series Sharpness Testers from Edge-On-Up. Measure and Quantify The PT50 Series of Edge-On-Up Sharpness Testers give the ability to measure and quantify the level of sharpness of any given edge. They work by measuring the force in grams required to cut through a standardized calibrated medium. The result is a number that can be used to compare the relative sharpness of edges. Designed for the Home User There are three models of PT50 Sharpness Testers. The Edge-On-Up Home Edge Tester PT50C Is intended for the home user or hobbyist looking for a reliable way to distinguish between a well sharpened edge and a poorly sharpened one and everything in between. The Home Edge Tester Features: 5 measurements-per-second processor 25 Gram Resolution Portable Lightweight Design 3 Button Operation 25 Disposable Test Clips Included 2 AAA Batteries Included Test Medium Included The Home Edge Tester includes the Disposable Clip System Test clips have not yet received full BESS certification. A Comparison of the Edge On Up Testers and What’s Included With Each Specifications and What’s Included With Each Model Model PT50A Industrial PT50B Professional PT50C Home Resolution Accuracy 1 Gram 5 Gram 25 Gram Measurement Speed 25 Per Second 10 Per Second 5 Per Second Batteries 2 AAA Batteries Included 2 AAA Batteries Included 2 AAA Batteries Included Test Clip Base Included – Included Test Clips 25 Included – 25 Included Aluminum Test Fixture Included Included – Test Media Included Included – Knife Fulcrum Included Included Included Q. What test method comes with the PT50C Home Edge Tester A. The PT50C Home Edge Tester comes with a 25 count package of the Disposable Test Clips and the Clip Base. Q. I’ve opened my New Edge On Up Tester and found a small empty box that says “Consumables.Should this box have something in it A. No. The box will be empty.