Has anybody used the nutradip ph tester? here is the link, is it any good?

I Had one and it sucked. Always lost is calibration, and after about 2 months it would not calibrat anymore. Now i use the Hanna Gro'Check and its the best ive had so far.Its fully digital and auto calibrating.that meansyou just dip it in calibrating solution and the meter does the rest.
 
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