Dear Wasim Karbasi,
1. The way to deal with sample charge is ok.
2. Firstly I am sorry for didn't inform you the new product N8-B, but I also need to explain to you that N8-B is also a regular product, it's almost same as N8, the only difference is the housing, N8-B is stainless steel, N8 is plastic, they have same capacity and function, N8-B is staying in trial-produce now, so I don't think it will have quality and functional problem.
3. The other experienced milk frother items are N3, N3-B, N5 and N8, you had already chosen N3-B, for the others, you can check with attached last quotation.
4. I sent other certificates to Suri this morning.