The Yamaha branded FI diagnostic tool was $114.00 [depends on current Euro exchange rate] from the company in the Netherlands referenced above and shipping took less than a week. The Chinese tool is listed at about $230. So the Yamaha tool is much more affordable. Personally, I'd rather kill myself before I shell out $114 to get 12V to the CO tool's terminals. You need that tool only once, to set CO to -20.