GTC TA100 Smartach+ Wireless Ignition Analyzer and Tachometer by General Technologies Corp

Great device. Great for ignition wire kilovolt testing. I also used it to verify my in-dash tachometer reading (turns out my in-dash tach is not that accurate). It's light and very easy to use, just hold it over the distributor cap and the RPMs pop up. It can also be used with distributorless systems (I believe all you need to do is to set it to 2 cycle if your engine uses a waste spark system). I needed to diagnose a vibration in an older GM car and the diagnosis required an accurate RPM reading. The SmarTach was key. I would imagine it would also be a great aid if you need to set idle speed or any kind of RPM dependent work. There are no wires to set up. It really is a smart diagnostic tool. Works with 2 to 12 cylinder engines, 2 cycle and 4 cycle.

I bought this to service and tune up chainsaws. The case is tough. The unit itself is very durable. Works exactly like the demo video in the listing. Very easy to use. Turns itself off after a minute of idle time (which is good for battery life). The reset button allows you to quickly get and clear your highs for carb adjustments on two strokes. Amazon has the lowest price by a long shot. Highly recommended.

I use this tachometer primarily for small engine (2 and 4 Cycle) testing and repair where my optical tach is impractical to use. On a few occasions, I have used it on V6 automotive engines. It worked well in all cases. Also, I have found it to be considerably more accurate than others of similar design. In fact, I returned another manufacturer's much less expensive model because of unstable, inaccurate readings. The TA100, so far, seems t be accurate and having the Peak kV feature can provide some insight when troubleshooting. The case is plastic, and unfortunately, uses a cheaper "living" hinge rather than a proper pinned hinge, and may split over time.

This is more expensive than some of the competition. The batteries are replaceable so this should last a while.I use this for tuning Carbs.

Liked everything.

I liked the fact that I could check RPMs and spark plug voltage with out hooking up wires

Sweet, it works on any small engine. It's so nice that it works from a distance or up close. 2 cycles are hard to tune, but with this makes it easy. Lawn mowers you can use to adjust the governor idle speed. Really responsive, gives you Max/min RPM. Perfect for the small engine shop.

I have not been able to get consistent RPM readings on small engines. I tested it on a lawn mower andtiller (both 4 cycle). Doesn't seem to matter if the probe is a few inches from the spark plug wire or right on top of it--the unit misses sparks and the readings double for a few seconds then return to normalor just go erratic. I got nothing close to the consistent readings shown in the string trimmer video.