"The PTF 20E instrument is a basic single drum tablet friability testing instrument. The drum rotation speed is fixed at 25 rpm with an accuracy of +/- 1 rpm (PTF 20E) or variable within 20 – 70 rpm (PTF 20ER). The total testing time can be set from 1 to 9999 seconds, or alternatively, set the total number of drum revolutions over the range of 1 to 9999. The PTF 20E/ER will accept both the conventional „Roche“ drum for Friability Testing as well as the Abrasion Test drum (with lamellas). The instrument can be equipped with the current 10° angle as specified by the USP <1216>, EP <2.9.7> for larger tablets of 13mm diameter or greater." [www.pharma-test.de]