Has Anyone Used This Ppm Meter?

Iv just bough this cheap ppm meter
http://cgi.ebay.co.uk/Digital-TDS-E...=UK_HGKitchen_SmallApp_RL&hash=item4aa8362b43
im new to all this and im stuck iv bough some CANNA nutrients and on ther grow guide it says ppm (hanna) (eutech) and (truncheon) which one do i refer to iv contacted the company i bought it off but iv had no reply yet please could som one help

My nutrients are Hydro Vega Hydro Flores Rhizotonic CannaZym PK 13/14 CANNABoost

I have one, and I have a cheap PH meter, so far the PH meter has been good to me, at first I kinda distrusted it, but when I checked with strips and color solution it was still pretty close everytime.

So far so good!!! And helps with my peace of mind i am not throwing nothing to crazy at em.