Portable Hardness Tester w/ Printer/Portable Hardness Tester/. Features. Loaded with the most popular features for hardness testing- w/Built-in Thermal Printer and USB output. Portable Hardness Tester specializing in testing large hard metal parts. Designed to test large hard parts: Example: Tool steel should be close to 1 thick of solid material. State of the art, digital tester is designed to test the hardness of large hard metal parts. Loaded with useful functions and a built in mini-printer the PHT-3500 is clearly the industry leader for fast accurate hardness testing with advanced USB output and thermal printing capabilities. The PHT-3500 can perform tests that easily convert to the most popular hardness scales, including Rockwell, Brinell, Vickers, Shore, etc.