I have a testo 556 digital gauge. For every day use it is a great gauge. If I hook up both clamp-on temperature probes to the same pipe, they read the same within 1 degree F. If I hook both the high side and low side gauge, the read the same. Period.
But the plastic case is not the greatest, the manual sucks, and the software only runs on one of my three computers. The software manual could use some work too.
I would buy some other probes, but the manual does not really describe what they will do or how.
They have wireless amp clamp, humidity probe, and other stuff. I have the data logging software, but it is hard to use.
Testo makes some great stuff, but their gauge sets still need some work. And they are pricy too. The strap-on temperature probe was $120.00 when I bought my first one, 4 months later my second one cost $180.00. I don't know what they cost now.
Just going by the complaints I see on that particular product swamp, I say they got a lemon there
Glad to hear from someone who has tried these guages, I 've been wanting to buy a digital set and was looking at the Testo and the "DigitCools".
At the AHR show last week I saw some new manifolds coming out that are milled from a solid block of aluminum. I think I'll wait for those to come out before I buy anything.
"You do not merely want to be considered just the best of the best. You want to be considered the only ones who do what you do.".... Jerry Garcia
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