Ferret Instruments 84 Digital Tach-Advance Timing Light

First light I received would not strobe consistently and RPM read out was never stable (plus or minus 300 RPM). I returned the light and Amazon was right on it sending me a new one. Unfortunately it arrived with no screws holding the faceplate so it wasn't attached to the light and the pick-up line had an electrical tape repair. I returned that one as well and expressed my displeasure back to Amazon. They took the high road and sent me a third light which arrived in one piece and worked like a charm. Was reading solid RPM and showing advanced timing with consistent strobing even at higher RPMs. I would rate the light much higher if I thought the quality assurance was better. If you get a good one - it's great. If you don't then I hope you bought it through Amazon because they will stand behind it and get it right.6 months later: Had the light now for a little over 6 month and it is a total, no wait, a TOTAL piece of junk. It has quit picking up the signal off the plug wire (multiple vehicles) only reads sporadically and only when you bump the set back button up and then back. It reads for about 15 seconds and then quits again. You may think you're getting a great light here because of the price but it's not true. Given the issues I had with quality control and now it's total lack of performance, stay away from this thing like the plague.

I use this all the time in my smog shop, last one lasted 5yrs.

Ferret Instruments( GXT) has gone out of business and these timing lights are junk!

I bought a Ferret 84 timing light which was rebranded a Cornwell, the exact same thing except blue in color. I probably used the light 10 times over the last few years and it worked ok but for the money not good enough. After the warranty period was up of course, it would send random flashes and make timing any thing hard to do and many times I had to revert to my $20.00 cheapo to do the job. This thing set in it's storage box for about a year and I pulled it out the other day to use on a motorcycle for a friend and it would not flash at all, it stays dimly lit and is useless except for display! I would never purchase anything made by this company again! You would think that in buying an expensive timing light it would hold up, certainly hold up sitting in the storage box it came in, not so!