Best BBT?

I was curious as to what BBT you all use? I bought one from walmart about 2 years ago but the battery is dieing in it instead of replacing the batterie i figured id try a little better one this time. I'm not wanting anything to pricey but something that is good :) thanks for the help in advance!

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    04/29/14
    4Katie
    Sorry, I never kept track of my basal body temp. I tracked my cycle by cervical mucous and cervical position. Let us know if you find a good one.
    1
    About Jackie Jones
    Born: Waynesburg, Pennsylvania
    Current: Maidsville, West Virginia
    Birth: June 19
    On Moms.com since: Apr 8, 2014
    My Name is Jackie I'm 29 years old && Married to my for going on 8 years. I'm the mother of 2 beautiful children Aiden who will be turning 5 in June && Addison who will be turning 2 in may we are currently trying for our last and final baby #3 :)