When sourcing manual tile cutters, prioritize the cutting length (ranging from 600mm to 1200mm+) to ensure compatibility with large-format tiles. The breaking strength of the pressure foot is critical; professional models should offer at least 750kg to 1000kg of breaking force for thick porcelain. Additionally, look for tungsten carbide scoring wheels with titanium coating for increased longevity and precision, and a solid steel or reinforced aluminum alloy base to prevent flexing during the snap.