Mercedes source on the net sells them. No ideal of price.

Going to get a small bottle jack and build my own. I estimate around thirty to forty dollars might do it. A small bottle jack with a side refill port. A pressure gauge from harbor freight, A salvaged injector line and a few common pipe fittings should do it.

Not big fan of Mercedes source but he does present a few helpful ideals in his utube videos. For example he does mention not to test spray into the open. Instead suggesting a practical containment device.

I have mentioned to people over the years to never start to syphon diesel or furnace fuel by mouth. Doing so with gas can result in some real discomfort but you will recover from it. You may not recover from the aspiration of diesel fuel.

So logically you do not want to aspirate any output from injectors under test. That gentleman shows you how to construct a testing chamber that vents to outside the space you are testing injectors in. You can easily construct one for only a very few dollars or even just scrounge up what is needed from your junk pile basically for free. You just want nothing to do with a fairly fine atomized fuel in the air where you are.

Also I noticed he is using his tester to drive really stuck pistons out of brake calipers.