Is this PPM wand good? Will it last for a while and is good quality?

Nutrient Truncheon Wand EC/PPM/CF Meter Hydroponic NR! - (eBay item 320198890446 end time Dec-24-07 07:09:48 PST)

Also which PH meters are better?

Oakton Ultra Basic pH Tester - (eBay item 200147232604 end time Dec-27-07 11:39:22 PST)

NEW Milwaukee PH51 PH Tester - (eBay item 330199243401 end time Dec-26-07 11:56:07 PST)

What would you buy?? I'm thinking hte milwaukee cuase its cheap...What you think?