If you are writing a product review, is the product review being done under an ISO Guide 65 accreditation? or in preparation for accreditation?
Are there any specific standards that the product is tested to, such as ASTM or others (e.g., IEC/CSA/UL 61010)? Such standards often have specific items to be included in a report.
Otherwise, some general information is necessary. Your organization name, addresses, etc., a full description of the product and even include digital pics, the reason for the review and the criteria (e.g., standards) the review is conducted to, the results of the review including any data generated, and of course review and approval.
Format should be easy to read.
Hope this helps.