​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​I knw i shd use Bbt thermometer but i don't get at this place in Vietnam. i take temp at same time. first time temping. suggest