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The flagship Edge-On-Up sharpness tester with 1 gram resolution, faster processing, and the most complete testing kit.
Purpose
The Edge-On-Up PT50A is made for anyone who wants to know if kitchen knives need sharpening, assess a knife collection, or check whether sharpening actually improved the edge.
Result
Compared to other models, the PT50A has superior sensor capabilities and a faster processor. The tester precisely measures the pressure required to cut through a testing medium, with an increment of 1 gram.
Included
Includes the PT50A device, Edge-On-Up Fulcrum support, aluminum base with DoubleX test medium, test clip base, and 25 test clips.
Comparison
| Specification |
PT50A
|
PT50B
|
PT50C
|
|---|---|---|---|
| Resolution | 1 g | 5 g | 25 g |
| Measurement speed | 25/sec | 10/sec | 5/sec |
| Batteries | 2 AAA | 2 AAA | 2 AAA |
| Test clip base | Included | — | Included |
| Test clips | 25 | — | 25 |
| Aluminum fixture | Included | Included | — |
| Test media | Included | Included | — |
| Knife fulcrum | Included | Included | Included |
Video
Watch how the Edge-On-Up sharpness tester measures knife sharpness using the BESS standard.
How it works
This scientifically designed tester assesses knife sharpness using a certified synthetic wire. Simply apply gentle pressure to the wire with your knife.
The accompanying scale records the pressure exerted until the wire is cut, providing your test result in grams on the BESS C-scale. A lower BESS value indicates a sharper knife.
BESS Standard
The BESS standard, developed by Mike Brubacher, offers a user-friendly method for evaluating knife sharpness. Scores range from 2000 BESS for an unsharpened knife to 0 BESS for ultimate sharpness. For reference, a double-sided sharpened razor typically scores around 50 BESS.
Testing method
Since the test measures only a small portion of the edge, it is recommended to assess three areas: the tip, middle, and heel. A weighted average of these values provides a more comprehensive sharpness assessment.
Essential materials
For accurate comparisons, certified test materials are necessary. Edge-On-Up provides the required materials, including the DoubleX test medium capable of conducting 325 measurements.
FAQs
This one comes with everything you need to use BOTH the Aluminum Test Fixture with the Test Media AND a 25 count package of the Disposable Test Clips with the Clip Base. It essentially comes with everything possible.
The Test Media is preloaded into the Aluminum Test Fixture. If you do not see a strand of media coming through one of the feed holes, slide the black rubber piece off of the bottom of the fixture. A role of Test Media should be inside.
No. The box will be empty. It is included as a packaging spacer and has been labeled "Consumables" for customers to use as future storage.
