Nutrient Meters

Hey Guys, I need some advice on choosing PH and EC meters.

What is my best bet, or bang for my buck?

I have seen try meters that tell me what I need to know, although, can anyone vouch for these ones?

http://www.ebay.co.uk/itm/Quality-pH-EC-Tri-Meter-Continuous-Monitor-Hydroponics-/260474346560?pt=UK_HomeGarden_Garden_PlantsSeedsBulbs_JN&hash=item3ca57b1c40#ht_2793wt_1264

Much appreciated

I bought the original, the Nutra Dip, and find its pH function to be primitive.

For pH and TDS/EC meters, my go-to brand is Oakton. cn