OTC 6589 Electronic Ignition Spark Tester (Automotive)

I own an automotive repair facility that employs 3 other technicians and I have been using spark testers for over 30 years and I have tried them all:1. The plastic encapsulated ones (not reliable or accurate)2. The "In Line" type - NEVER - NEVER USE THESE!!It only takes around 10,000 volts to "light" those up - but todays cars need upwards of 50,000 volts so you'll have a "light" but not enough volts to fire the spark plug.3. I have had 2 OTC 6589's in my box for 20 years - they ALWAYS work AND tell the TRUTH!Yes, I have played around with the others and ALL OF THE DIFFERENT STYLES OF THE FIRST 2 I LISTED HAVE CAUSED ME TO MISS A DIAGNOSTIC. (Hence - cost me productivity time & money)But, when I am in doubt, I grab my OTC and PROVE IT!I NO LONGER USE OR ALLOW IN THE SHOP ANY OTHER SPARK TESTER THAN AN OTC.When I am diagnosing a V-6, V-8 or V-10 motor, I use 2 of these at the same time - one on each side of the motor.Sadly, I...Read more