Clark component tester 1802057 and reference guide.
Used for checking SCR’s on forklifts, speed controls, welders, electric tow tractors and trucks etc.
Used to check:
* SCR's blocking voltage or leakage test, Diode reverse.
* Diode and SCR forward conduction.
* Capacitor leakage and capacitance test.
* Peak reading voltage test.
* Typical insulation resistance test on motor or generator.
* Zener and Suppressor test.
* Battery self test.
There is a nice manual in pdf format that can be downloaded for free from the internet.
Lots of information there.
Cash and pickup only.
New Lenox, IL near Laraway and Schoolhouse.