I bought a Blue Robinair Model 15600; 6CFM Vacuum Pump, 15 Micron, Enviro-Guard Manifold Kit, Robinair Model 48510, for R134A. Then I bought a Robinair/TIF9020A refrigerant scale. They are all made in the USA and are of excellent quality. The reason I bought this TIF9020A is because it is the latest model they offer. According to the Robinair tech team I spoke to, if something goes wrong, the old TIF9010A scale is beyond repair. Not that there's a problem with that, I'm more comfortable withβ¦