Cost me 28 bucks to drop 3.7v down to 3.0v.... I feel robbed. (LDO, caps, SOT-23 breakout board)But at least it works! I tried a 3.3v zenner diode but the voltage was still too high at 3.3v... (guess the temperature sensor on the weather station is calibrated to 3v, the 3.3v resulted in a temperature reading 4-7 degrees F too high. Coulda just gotten a 3v zenner diode i reckon...
This kit has served me well https://www.amazon.com/gp/aw/d/B00JQ753W8/ref=ppx_yo_mob_b_return_o0_img?ie=UTF8&psc=1#immersive-view_1550611488912Wiha
I like the LIFETIME WARRANTYI presume that means "for the life of the tool" ...R