Start with the required surface
Engraving removes material to produce a recess. Other marking processes can change the appearance of a surface without the same recessed profile. Suppliers sometimes use these words differently, so a purchase order that says only “laser etch” can leave important details unresolved. State whether material removal is required, allowed or prohibited. Keep the drawing requirement separate from a preferred machine or brand.
Define what the buyer will accept
Specify the text, artwork, location and orientation. If the design controls depth, include that requirement and the measurement method. If appearance is the concern, use an approved sample or a defined visual criterion. A photograph can help communicate contrast, but it cannot establish a measurable groove depth. For a code, readability and verification are separate acceptance questions.
Compare like-for-like quotes
Consider two quotations for the same part number. One may include a shallow identification mark; the other may include multiple engraving passes and depth inspection. Their prices are not directly comparable. Ask each supplier to identify the proposed process, finish condition at marking and included inspection. Resolve differences before selecting on unit price. For repeat orders, retain the accepted process description with the artwork revision.