The PTA01 accommodates one jar, the PTA02 can handle two jars. Easy adjustments can be made to the sturdy roller bars to accommodate jars from 1liter to 10liters. Each milling machine comes standard with a breaker switch.u003c/pu003e"} Shimpo Ball Mill for 2 Jars. 1, 1, Ball mills have been used for decades to grind and mix materials used in the ceramic industry. SHIMPO's ...