Answer: four places where two quotes for "the same cable" stop being comparable.
- Copper basis — copper moves; a quote with no stated basis date is not a price, it is an opening position.
- Length tolerance — "3 m" can be 2.9 m; tolerance should be stated in writing.
- Test scope — 100% continuity versus sample-based high-frequency testing are different products at different prices.
- Packaging — polybag versus printed box changes the landed cost more than the cable often does.
Put all four into the RFQ so every reply answers the same question.