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Ships within 48 hours · Estimated delivery Sep 9 - Sep 14
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Description
JFIND JF109 Car Double Hole Spark Plug Tester, JF109 (US Plug), JF109 (EU Plug)Feature: 1. It has two testing holes, you can test two spark plugs meanwhile and and if you suspect any spark plug works improperly you could compare and test to make accurate judgment. 2. Adjustable double hole car spark plug tester detector ignition plug analyzer diagnostic tool. 3. Usage: test spark plug performance and ignition strength 4. Application range: 12V Gasoline vehicles car spark plugs 5. Widely application: 100V 240V input voltage . 6.
Feature:1. It has two testing holes, you can test two spark plugs meanwhile and and if you suspect any spark plug works improperly you could compare and test to make accurate judgment.
2. Adjustable double hole car spark plug tester detector ignition plug analyzer diagnostic tool.
3. Usage: test spark plug performance and ignition strength
4. Application range: 12V Gasoline vehicles car spark plugs
5. Widely application: 100V-240V input voltage .
6. Test principle: In automobile ignition system, the high-voltage ignition coil generates a high-voltage (10000 volts or more), and the spark plug diverts it form high -tension ignition coil into the cylinder engine, spark between the spark plug electrodes will ignite the mixture. The JF109 could tell the good spark plugs from the bad by the strength of the spark.
Using Note:
1. Please Turn Off Power before you place spark plug
2. The Spark Plug Tester is a high-voltage detector, so do not touch spark plug with hand at work to avoid danger.
User Manual:
1. Place the Spark Plug into tester hole 1 or 2; If you want to compare the new spark plug and old one, place new spark plug into hole 1 and the old on into hole 2
2. Connect to power supply
3. Turn the key switch 4 clockwise to turn on tester, indicator 3 will light up, tester is now working at 1000rpm/min.
4. Again turn the key switch 4 clockwise,you can adjust the working frequency between 1000rpm to 6000rpm/min.The higher the frequency, the stronger the spark strength.
Specification:
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Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 18 reviews
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Product Reviews
★★★★★ 5
Soft and cozy fot
Fits well and is nice and cozy material look is as was needed for cos play uniform and fit was perfect the material is soft and is light weight for summer use for things without over heating and I am a big guy who over heats on a regular basis
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Reviewed in the United States on July 15, 2025
★★★★★ 5
Gals can wear this too!
Color: 2 Pack(black+white), Size: XX-Large
Do you know how difficult it is to find a cotton mock turtleneck??? This review is NOT for guys but for gals. Being in menopause my temps are all over the place-- one minute I'm hot then I'm freezing. I needed a short sleeve (plus size) cotton mock turtleneck to wear under a cardigan. I'm so pleased with this shirt... the fabric is soft, NOT see-through, it's breathable since its primarily cotton (95%), it's not super tight, and it's comfortable. Hopefully the info will help other gals looking for similar shirts.
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Reviewed in the United States on October 27, 2024
★★★★★ 5
Quality is great
Color: 2 Pack(black+wine Red), Size: Large
Very good shirts
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Reviewed in the United States on February 13, 2026
★★★★★ 4
Okay shirts if they fit. Neck stretches out some with washing.
Decent shirts. It's difficult to buy clothes online because you don't know how they'll fit until they arrive. The small was too small, and the medium is just a little loose. I'm 5'8" and 150 pounds after losing 65 pounds in a year. I work out and have some muscle. Shirts look good on my chest, but the sleeves are a little too long, and the neck is starting to go bacon after just two washings.
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Reviewed in the United States on November 8, 2025
★★★★★ 5
Good Value
Good value, nice fit and machine wash and still look nice. Very soft, fabric holds up well and olive and black are perfect neutral colors
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Reviewed in the United States on September 16, 2025