Home › Blog › Buying Guide › Technical Evaluation Guide: How to Identify a Quality Used, Secondhand, Pre-Owned, Surplus TOPPER TNL 120AL CNC Lathe made in Taiwan 1) Machine & Model Background / Benchmark Specs Before the site visit, gather the original specification sheet for the exact unit (TNL-120AL, TNL-120AL I, or variant) so you have benchmarks to compare....