Perten Instruments’ Disc Mill LM 3310 replaces the company’s previous model LM 3303. According to Perten, the LM 3310 has the same grinding chamber dimensions, grinding discs, and particle size, distribution and moisture loss as the LM 3303. But, the company says LM 3310 features a built-in motor, disc distance setting and a start/stop switch on the front of the mill.