Brand Roch Suisse
Unit Type Unit
Indicator Type Spark Erosion
Unit Quantity 1
Country of Origin United States

Check the listing for details. Roch Suisse RUGOTEST 107 Spark Erosion Surface Texture Sample Architect/Engineer. Condition: Used, Made in United States. Listed at 12.95 USD. I have to admit not knowing much about this at all. Anyway, it is a pretty cool thing as a "whatzit" at any rate.(and expensive I'm sure). various surface texturing on a number of substrates, with this example being polished nickle.

$9.07
$12.95