I've got the Inficon right now and it seems to be very accurate, but the top of it has cracked and also the clear plastic viewing window. If I didn't know better I would think someone stepped on it. I'm thinking that they've glued the window in place and the heat in the van has caused the cracking. I'm getting ready to buy another complete set of tools for the new van and I'm going to try something different. I also have their Shark pump and it's well built but bulky.