Jan 17, 2005 · The testo 557 is a full function analyzer. With 39 refrigerant profiles plus H 2 Ostored on the processor and unique temperature and atmospheric pressure compensated sensors, the testo …

Feb 21, 2025 · I just received the Testo 557s today, which came with the 552i. I’m using it with a Milwaukee vacuum pump. When I connect my Testo 552i directly to the Milwaukee vacuum pump, it …

Feb 21, 2015 · The new Testo 550 for less than $265 is looking better and better. If you had the choice between this new Testo and the Fieldpiece for about $75 more which would you go with and your …

Jun 30, 2018 · Hey guys tring to decide between my first set of digital gauges. Currently just do Resi service work and light commercial service. Just wanted to hear everyone's thoughts on whether I …

Aug 8, 2014 · Hey everyone, I'm having trouble with my Testo 557 gauges. To start I love them, they perform all the functions that I need. My issue is that when I'm pulling a vacuum, the micron gauge …

Jul 29, 2021 · I may be in the market for a new set of digital gauges soon. Not sure what the latest greatest on the market is. I was looking at the new Testo or Fieldpiece SMAN Sent from my iPhone …

Mar 23, 2012 · Is any one using the testo 557. I just got it out of the box and hooked it up to try it out and get formiliar with it. And the directions are very vague on how to get it to calculate superheat and …

Mar 17, 2020 · Good day, I have a Testo 557 problem. The testo has a vacume unit attached. When i pull a vacume is got to about 40 pascal what is a good vacume. Then i close alle the ports on the …

May 29, 2012 · I got my new Testo 557's today. Kind of excited to hook them up to a unit. Anyone have any do's or don'ts?

Dec 1, 2004 · Bought the 557 2 weeks ago, put it to the test and the microns readings are way lower than actual, it was reading between 500 to 0 microns when the actual pressure was over 1000 …