This is Not a recommendation for anyone,& I advise against it!I have been out in the boonies more or less in the past,& Just didn't have my Multimeter handy(shucks! I alway's carry my multimeter on dayhikes/expeditions)I needed to check the load of a 9v battery,hello mr. tongue,whoa! spit a few times,Habanero pepper = Full Load,tested another,spit some more,Jalapeno pepper = 1/2 load,tested yet another,no spit required,Bell pepper = dead battery