When sourcing a used tablet press, you must prioritize the mechanical integrity and output capacity. Key specs include the number of stations (which determines production speed), the maximum tablet diameter, and the maximum filling depth. Ensure the machine supports the specific tooling type (B, D, BB, or DB) required for your products. Additionally, verify the compression force (kN) capability to ensure it can handle your material's density, and check if the motor and electrical components have been upgraded to modern PLC control systems for better precision.