Identify mandatory criteria first
Do not treat every characteristic as equally important. Compatibility, size, capacity or a document requirement may be a decision threshold.
Attach a source to every value
Keep the source and date beside technical values so later updates remain traceable. Mark missing information as pending verification instead of guessing.
Make qualitative information visible
Installation support, training material and document language may not be numeric, but they still matter in procurement. Add them as explicit evaluation criteria.