Millie-ties are GREAT!
Get 'em at radio shack
I have sent my 557s back twice in less than a year to be reset (?) adjusted (?) calibrated (?), (I am not sure because testo never tells me what they did). All I know is I am sure there will be a third time.
When on R 22,it seems to think the pressures are 450 on the high side, 180 on low.
Yes I have it set to r 22, yes I blow it each and every time I change refrigerant, which was only once.
Its been the worst tool I ever bought, and I am not impressed with testo's customer service. I don't think I am ever going to buy testo anything ever again.
I would not rule out Testo just because their digital manifold does not work right...
No body can convince Testo ans FP gauges are not worth the investment. And if you have trouble with customer service...just a suggestion..."Youu catch more flies with honey than vinegar".