Review on 🚗 BELEY Automotive Spark Plug Tester with Protective Cover – Dual Holes Ignition Plugs System Analyzer for 12v Gasoline Vehicles (Spark Tester with Cover) by Tim Wadman

No instructions. I installed a couple of candles using the only way I could find out that it worked and when the bulbs were turned on there was a high frequency noise flashing but I didn't see a spark on the candles. I tried 2 different candles, turned on, saw a brief spark from 1 candle, then it went out and that was it. I checked the power plug which was fine, I couldn't revive it. I'm giving 2 stars instead of 1 because I doubt this could be something I've done, but the lack of instructions should have been my first clue. Not worth messing around with so I sent it back.