BASAL THERMOMETER RECOMMENDATIONS?

Bella
Looking for a basal thermometer on Amazon/online and none of them seem to have glowing reviews. Anyone here have a recommendation? Also, can you just use a normal thermometer to read correctly or does it have to be a special basal one? 
I've never tracked my basal temp before ~ upping my game and starting this month. 
🌸💗🌸💗🌸

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