Sorry been a while. The product I used is called PROFI Laser Cat. I bought mine through Moto-Tech,
www.mototechdiagnostics.com.au or call 07 3385 7977 or 0405 548 757. Seriously quick to use, bring chain up to correct tension (see owner manual) then adjust brake side until laser runs up entire lenght of chain (laser lines up on the outside plate of the chain), then re-check chain tension etc.