Fieldpiece SM480V Rugged tried and true extremely reliable. The exact opposite For Testo 557S

If. There is a refrigerant manifold that I could put my name behind and stand behind that I beat the hell out of use it multiple times a day use it when it’s raining use it when it’s hot I don’t baby it I literally throw it in the back of my vehicle and it always works.
Fieldpiece SM480V