The Astro Pneumatic Digital LCD 3-48V Wide Range Circuit Tester, No. 7764, is computer safe with a back-lit LCD display for accurate voltage readouts of electrical circuits and accessories on all 3-48V systems. Its small, ergonomic design accommodates use in confined areas, and the tester can be used on cars, trailers, vans and more. It is constructed with a needle-sharp, stainless steel probe which allows for easy piercing. Also, an 11' cable adds convenience.