Top critical review
Sorta Good DIY Tool - with a weakness
Reviewed in the United States on August 24, 2016
All plastic but seems well made. Maybe not for a busy garage, but for shade tree mechanic and occasional use it's fine. Parts fit together well and color gauge is easy to read. Good owner manual provided. Having this available to test rad caps and potential cooling system problems is very convenient. The initial cost is less than paying a mechanic to test the system. Storage box would have been nice, but the formed plastic packaging can be used instead.
Edit 11/21/2016: I have used this tool several times now and found a weakness. The vinyl tube connection to the rad cap adapter can leak unless tightened - A LOT. I would recommend using a soap solution on the connections to make sure it is sealed, especially if you're doing a long term pressure test, If it leaks you'll think you have a coolant leak, when you don't
I also found that I had to tighten it so much that getting it detached was extremely difficult. I have downgraded the rating to reflect this deign flaw.
Further Update 03/19/2017: I have had to use a small o-ring on the rad cap adapter fitting where the vinyl tube attaches. As noted before this tends to leak, even when tightened. Each time I use this tool I have to check for fitting leaks with a soap solution. I have had to further downgrade my rating.