Review on MASTER MST 101 Automotive Electronic Detector by Joe Duncan

Instructions in broken English but easy to understand. The battery compartment doesn't exactly fit the batteries until you put the cover on, but whatever. The general feeling is that it's very cheap, but it compares very cheaply to alternatives and it really works. I used it to test the coils (coil over connector) on a 2013 Jeep compass. It has two sensitivity settings and I couldn't tell any difference between them. It picks up noise from the coil next to the one being tested, which is annoying. I solved this problem by covering the end with my hands when testing, which makes the indicators easier to see anyway. Helped me see which spool I was having trouble with at times, which is very handy, especially for such an inexpensive tool. I recommend this, but I'd like to try one of the more accurate versions with finer sensitivity settings and see the difference.