testo 557

these units take the guess work out of superheat and subcooling, No need to have 3 or 4 instruments running just pop this unit on your line set and monitor what is going on. Some models have Bluetooth so you can monitor your Relative Humidity of the return Air (Saturated heat load) I bought the blue tooth add on. Fantastic system no guess work only way to mess this system up is to not pay attention.

can be used in rain without failing, can be used when stored in hot and cold weather, they are not effected by the extreme, easy to set up, small compared to most brands. Only issue is the hook, not good, will pop out of socket after about a years use but this to me is small compared to the work you will get out of them, hook does not effect operation.

Awesome digital manifold set! Great German quality!!! The included calibration certificate for the manifold and the one for the vacuum sensor further add to the validity of this unit. I sent it to an independent lab upon receiving it and they arrived at results within .005% of what was shown on the calibration certificates included with the set. In short, this set beats the stuffing out of ANYTHING the Chinese try to produce.

I love the gauges. I’m very disappointed in the hoses. After spending so much money which was prompted through my need for new hoses, I received these crappy hoses as well with my gauges. I guess I’ll spring for yellow jackets as well. Thinking I’ll be buying the 605i as well shortly, the gauges are great but to get the right SC & SH you need indoor wet bulb. Can’t come this far and start guessing! I attached some images of the app from my phone. You won’t regret it, spring for your own hoses.

I use these gauges only for installs. Mainly because i do service and use my testo probes more often. But then it comes to an install or ripout this is my go to tool. I use to for flowing nitrogen when braising, i use it for the nitrogen pressure leak test, i use it for my vacuum to get lineset at 500 microns restings. precharge linset, then run system to tune chart. The only thing i don't like about this is the vacuum probe. why have a include a probe for vacuum and micron readings when you could have just have had it built in. Yes this is considered as not up to date like the newest testo digital gauge mainfold but wtf man. I have to take a few extra steps just to preform a vacuum. But despite that one gripe and for the price. 5/5

These gauges are well built and can pretty much do everything. I hook them to my 7 cam pump and the large hose can pull vacuum stupid fast

I was worried about spending that much money on this. But the amount of work that can be saved trough this tool makes it worth it. Also look very profesional and sturdy. Awesomely precise on the readings. Exceeds expectations. I liked it more than fieldpiece's sman460 because of the looks, easier to handle and come with a case. (Wich could have been a bit more protective) but still was included in the price.

Extremely cheap plastics everywhere, still had quite a bit of plastic flash on the knobs left over from the molding process. Temp probe clamps felt like they would fall apart at any time. This might be an OK digital manifold for ~$200, definitely not worth the $540+ pricing.