I got tired of bogus info from injector people ... so I bought a cheap tester off Ebay . Pretty cool to be able to see the results and clean them yourself .
After you get the fluid loaded which takes about 15 min . then injectors about another 15 min. The test runs for a minute ....I did that about 5 times and they were tested and clean . The ultra sonic part mostly just cleaned the outside so I didn't use that after the first time I tried it out .