Let me start by saying, the GTC GTC505 Engine Ignition Analyzer is a game-changer. Whether you're working on marine engines, motorcycles, or cars, this tool makes diagnosing ignition issues a breeze.

The real-time display of ignition waveforms is incredibly detailed. I've used it to pinpoint primary and secondary coil faults in seconds—something that used to take me ages with traditional methods. The chart and comparison functions are lifesavers for catching those pesky intermittent issues.

One of my favorite features? The ability to measure spark peak voltage and detect ramp time. It's like having a mini oscilloscope in your pocket. I recently used it on a '94 Corvette with an OptiSpark distributor (a nightmare to work on), and within minutes, I identified the misfiring cylinder. Saved me hours of guesswork and unnecessary part replacements.

The build quality is top-notch—solid buttons, intuitive software, and a robust case. The display is big enough to read easily, even in dimly lit garages. However, I do wish the kit included an extension cable. Also, the BNC connector for the gooseneck probe feels a bit loose; I'd recommend getting the GTC505-CSC extension cable to avoid any future issues.

Some users complain about the spark voltage jumping around, but that's just how ignitions work. The key is comparing cylinders to each other, not fixating on individual readings. The 'chart view' feature is where this tool truly shines—it instantly shows you if something's off with big voltage spikes.

Bottom line: If you're serious about diagnostics, this tool is worth every penny. It's fast, accurate, and eliminates the need for outdated methods like cylinder drop tests. Just be prepared to fall in love with troubleshooting ignition problems!