im with rcken, i love my tachometer and expanded scale voltmeter all in one package, takes up less space in the flight box, making it more likely to have both with me at once! .............now that i think about it, there is no way i can't have both there at once. point being, it is a handy device that serves double duty and seems accurate compared to the globees in the club which i have heard only good about as well.