Which parameters must be checked when buying an oven thermostat?

Check temperature range, differential, capillary length, bulb size, contact rating, mounting type and terminals. Insufficient contact rating causes heat, sticking or control failure. Checklist: Define capacity, accuracy, materials and operating environment before requesting quotes on a uniform basis. Request specification sheets, test reports, certificates, maintenance manuals and spare-part lists. During acceptance, verify appearance, dimensions, functions, safety protection and packaging, and keep test records. Do not compare unit price alone; include customization, freight, spare parts, after-sales support and downtime risk. Keep written records of inquiries, confirmations, FAT, acceptance and warranty commitments.