One (1) used KEY International Pharma Test Model PTB 301 Tablet Hardness Tester. Specifications for this unit are as follows, sample size 4-40 mm, stroke length: 4-40 mm, chart speed: 3 mm/second, measuring rate: 5-300 Newtons, displayed on LED display and printed on built in printer, display down to 1 Newton Unit features interchangeable Measuring Jaws for different material, I/O Interface: RS-232 serial, dimensions: 53 cm x 24 cm x 18 cm (W x D x H).