This Performance Tool W87030 Hand Vacuum Pump Kit is an all-in-one solution for brake bleeding and automotive testing. With a wide range of applications, this kit includes accessories for both brake bleeding and automotive diagnosis, making it a versatile addition to any garage or workshop. The vacuum gauge scales in Inches of Mercury (Hg) to provide precise and reliable results in testing and diagnostic work. The pump can develop and hold up to 25 inches of vacuum (Mercury Hg) and pumps approximately 1 cubic inch per stroke, making it easy and efficient to use for both professionals and DIYers. Diagnose vacuum problems, bleed brakes and more with this brake bleeder kit.