ST100 Automotive Spark Plug Tester ST100 Automotive Spark Plug TesterSpark Tester

Awesome little spark plug tester. Two testing banks with a control dial to crank up the power to the plugs. This handy little tool takes the guess work out of if your spark plugs are good or bad, or if you want to check the plugs rolling around your toolbox. The only thing I wish it had was a plastic shield to go over the plugs to protect anything touching them while you are testing. Overall, I'm very happy with this tool.

This can be a handy tool for understanding how your plugs are actually firing, or if they are firing.Most plugs fail at lower RPMs thats why you can get hard to start conditions.I didnt do a bunch of extensive testing, simply because all i had was motorcycle plugs lying around, and they generally (atleast on import bikes) dont use the standard plug end that cars and trucks do.I didnt have a screw on adapter available, so my results didnt show what i expected because the power had to jump from the connection inside onto the plug then fire at the electrode, which gave me a weird looking spark at the electrode.This could be handy for the DIY user if the plugs are hard to test on the engine. Although unless you know what your looking at its a waste of money.As ive been working on anything with wheels nearly my entire life, I can read what the plugs are showing by their condition without me needing this tool.Now i personally do not need a cover over the plugs, but it would be nice to have for safety sake. (safety third lol)I found it wasnt very accurate at lower rpms, but that could have been because my plugs did not have the right adapter.Overall it could be better, but does what it claims.

As most have said, the spark is somewhat difficult to see in the daylight. I don’t view that as an issue. Just flip the light switch.my issue is that the newer??? thinner plugs do not click in and lock into the device. The plug on the left is from my 06 F150. the fatter plug on the right is from my 98 F150.Yes i use the word newer with some sarcasm.the thinner plugs still shows some spark but it does not seat well in the device and i would be hesitant to blame the plug for negative results.

If you are suspicious of a spark plug not working and don't want to use the conventional method of testing it, use this! It works great, has a range of speeds to choose from, and is lightweight and compact! 10/10!

Need a way to see if spark plugs are in good shape or test some. This tool does that just by inserting sparkplugs and plugging the device in to run the test. It worked great the first time ever used and makes another tool to have in the toolbox if mechanic. I haven't used much but will update after a few uses of the tester to tell more. Great tool for mechanics and technicians.

This tester will be the right tool to make sure your spark plugs are in good condition, making the maintenance of the cars fast and easy to perform. I would like to see several different sparks plug able to test like mower or any other small gas engines. Looking at other testers this one should have a cover on top and around the testing area of the spark plugs.

This is to test your spark plug if it is working. It works on smaller 14mm and 5/8 inch spark plugs which I have on hand. It was able to test if it works and also to test them at varying speed which is cool to see. I think I only use it to enjoy seeing sparks. Honestly speaking, it can be used on old carburetor engines as this is one way to diagnose the problem. You can also use this on new ones but new ones are made of iridiums and rarely break before the recommended replacement schedule comes. I usually see ignition coils failing first. With the advent of OBD2, the car can already tell you what the spark plug is broken. I usually replace sparkplugs when misfires happen which tends to not fix the problem but plugs are so cheap, might as well replace them. This will be helpful with diagnostics as a working spark plug leads you to looking elsewhere to solve your misfire problems. Highly recommended.

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Ok, now this is cool. Very easy to use, cheap, and compact spark plug tester. It works exactly as advertised. Will hold 2 plugs, and has an adjustable knob for frequency. You fire the plugs and watch them for good spark, while adjusting RPM. Make sure to push the plugs down fairly hard in the holes to get them clipped in fully to the connector. Once they are connected, just turn the dial. LED's indicate power to the plugs and a red light for operation. I don't often need to test spark plugs, but it's very cool to be able to do it quickly and easily to rule out a problem on a motorcycle or car. Very handy, I would recommend it for sure.

As the ad says, the short plugs don't work in this. But, with a little ingenuity you can create a snap-on adapter to clip onto the top of your short plugs to make it work. I had a can of lawn mower plugs that were questionable, and now I know exactly which ones are good. The spark is weak, but it's not designed to throw a lightning bolt to be seen out in bright daylight. Easily seen in the garage.

Works good, no more guessing if the plugs are good

Short plugs don’t reach the contacts, so product is uselessWith regular plugs does the job

Mehr Spielzeug als Tester

Dieses Testgerät funktioniert NICHT bei Zündkerzen für Rasenmäher, Motorsägen, etc. weil diese für das Testgerät zu kurz sind. Das steht erst im Manual. Das ist ein Minus, weil das sollte schon auf der Produktseite angegeben sein.

Arrived on time, this spark plug tester works well,but can barely see the spark during lihgted areas.

This comes with no paperwork or instructions, so you will have to experiment with itThis simply would just tell you by viewing the arc emitted from the end of sparkplug that they functionbut would not show if there were any cracksThis tool just allows small spark across the gap, so the shorter gap is than the less sparkYou will not see that spark unless the room is darkReally cannot tell the full quality of the sparkplug with this, as the tool itself tells you nothing andyou're just judging what the spark looks like

It does the sparky thing

It's okay for the price but made cheaply but it's the job

The power plug broke after 30 days, was able to exchange it, but a hassle all the same. buy a better one...

I must be one of the few paying customers for this item. It does work if you are in a dark room. The spark is so weak that it can't be seen in a room with the lights on. there is no spark at all below 2000. Maybe the power supply that they give is too weak.

Since I have used this type of tool in the past, I can say that it is low quality and produces very little spark. I did not send it back because most of the time it is not the seller's fault. They buy products to sell just like we do at times.

Funktioniert

This is a pretty basic spark plug tester that just works. The dial for the interval is very nice touch, allowing you to test the plugs are different frequencies. It's a very handy tool to have for the automotive DIY'ers.One thing that I wish it had was a cover so that you don't accidentally touch it when testing the plugs, as it can be quite dangerous.

Haven't used it yet. Looks ok

It's one of those things that i didn't really want or need but once i got it i found it way more useful than i expected. I work on cars as a hobby and not to take any chances i usually just replaced all the sparkplugs whenever i could.Now i found myself keeping a brand new sparkplug on hand and i just compare the old ones and see if there are any anomalies or weak spark. Saved me quite a lot of money already.You do have to check them in a completely dark room though as it is a very small spark. You can hear it too. Being able to adjust and simulate RPM is amazing. i did find a few old sparkplugs that were consistent on low RPMs but when cranked up they would struggle and misfire.

Works really good easy to operate

Usefull tool for check spark plugs.