Ok so this one is a bit above your target amount, but I have used one of these for 3 years now with 0 problems.
http://www.ebay.com/itm/HM-Digital-...108?pt=LH_DefaultDomain_0&hash=item45f82bac24
i paid 70 for this also blue lab very easy to use, one screen, three buttons on/of, calibrate, units very simple
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Where did you buy that one from? It isn't on getbluelab.com.
IMHO i have gone through Milwaukee, gro stick and nutri dip meters... hands down spend it wisely.. if your ph is off its off.. get a good meter buy a quality product calibrate it often clean it well...