Dave, Bonjour, VERY interesting post! My specialty as inventor and EE, with many Fluke (TM) meters.
1/ In USA//UK/EU law the Trademark and patent holders are responsible to persue any infringement /misue or risk loss of the trademark or patent.
I m unaware if AU law may follow this common IP law practice. ANY misuse of a widely know mark held by a large corp eg "Dolby" can and will be persued by their legal dept.
E.g. at Dolby Laboratories back to 1970s we had an entire legal and engineering team to enforce Dolby patents and trademarks, even individual's misuse.
Failure to enforce the TM/Pat/IP can lead to their trademark being legally chalanged and becoming public property.
2/ Trademark law in most countries allows use of the trademark but NOT "comparative disparagement"
Your listing compares and disparages the Fluke meter.
https://www.lexology.com/library/detail.aspx?g=9426f6d2-3aa9-42a6-96fd-c0b56daf0fd6That misuse can lead to a potential damage to the Fluke trademark reputation.
Example: OK: "Drink Pepsi, it a great thing"
NG "Pepsi is healthier than Coca-cola"
Thus you can list any Fluke meter and mention Fluke but advertising or listing "better than Fluke" is not allowed and risky.
The notice and letters are rouitne "boilerplate " and required to defend the Fluke mark.
3. The EULA/T&C of Ebay, will have a term saying that Ebay has the right to reject any listing arbitrarilary. Thus, use of Ebay site is not a "right" but a "privelidge" .
I believe that instead of your use of Fluke in the ebay post, you could instead just have a table of comparison of specs, features but mention just the model # but not the wod Fluke.
EEVBLOG # 287 87 187
Bon Chance!
Have an Absolutely fantastic day!
Jon (EE '68)
(since 2003, I have survived and won 160 IP litigations )