We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember Grimly Curmudgeon
saying something like:

I'd suggest you look on ebay.com USA for one of
the old Kane fluid testing kits

I meant to write Bacharach. Doh.

This is the thing - the BIN price is a bit high, but worth it if you're
going to service your boiler twice or more.

http://cgi.ebay.co.uk/390207871515

Keep an eye on subsequent offerings; they pop up frequently.