I always interested in test equipment and i found this photo from one of the website in google. From the photo it is written as Arrow coil tester but internet search did not reveal any result. I’m not sure what type of coil it can test but most probably this coil tester is meant for the automobile ignition coil (by looking at the thick probes). Well, if you are creative enough you can use it to test on variety of coils which include coils in the consumer electronics. If you have any info on this coil tester please give your comment below-thanks!