Don't you get it that no matter what tools you use and no matter how much information you give, your word can not be trusted in this case?
It's not that we think you may cheat or lie, it's simply the case that since you sell this multimeter and promote it, you may be BIASED.
Often people do it without even realizing, due to being proud about selling the product, due to being a fan of a product line or a brand, due to lots of things. People need to have a product reviewed by someone who has nothing to gain directly by reviewing the multimeter.
The best thing to remove all doubts from people's heads is to send a multimeter for review to Dave or someone else with good reputation here . I'm sure Dave would do it - he gets to make a couple of videos with it and some money from Youtube ads and views, you get your stuff advertised on EEVBlog for the price of shipping a multimeter to Dave.
If it's about money (and I could understand that, since those multimeters are a bit expensive compared to an Indian's average monthly pay), you can ask Dave to send it back after he's done with it, I'm sure he would be willing to do that. Then your only loss is the money to ship it to Dave and to ship it back to you.
ps. I stayed away from this thread on purpose because I don't care about all that "german technology" thing. Some may think you were lying about it, I just think it's a communication issue, as in what you're saying by that is interpreted by people here in another way. It can happen when dealing with people from different continents, with different languages and all that.