The UHVP Sensor 8 Scale is for the SVG-3 or Apollo Vacuum Gauge. This is a post upgrade to work the 3rd UHVP port. The K.J. Lester Vacuum Gauge is the workhorse for all vacuum measurement applications. This controller combines two sensor systems into one small device to measure from atmosphere to 1×10 – 9 mbar. The patented ultra-low magnetic stray field design opens up a whole new range of applications. A unique interchangeable dual chamber sensor unit avoids cleaning cycles and reduces maintenance, making it the most robust and economical vacuum gauge of its kind. KF25 flange.