If you google them, they have 16 google reviews currently. 

Only 2 are negative, which Ferntech has responded to.

I have a friend who works there, at their shop in Ferrymead, Christchurch. I can assure you they are legit.

Also have a look at their Facebook page.

Cool.. glad to know that! Thanks!!!

They have been around many years - I purchased a breath meter from them almost a decade ago. I see they have branched out into other lines in the last few years.