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Description
DUOYI Automobile Dual-hole Spark Plug Diagnostic Tester, DUOYI EU Plug1. Power adapter: Input 100 240V AC Output 12V 1A DC 2. Purpose: test spark plug performance and ignition strength 3. Application range: 12V gasoline engine automotive spark plugs 4. The dual hole automotive spark plug tester has two test holes, which can test two spark plugs at the same time. If you suspect that any spark plug is not working properly, you can do a comparative test to make an accurate judgment 5. Test principle: In the automotive
1. Power adapter: Input 100-240V AC / Output 12V 1A DC
2. Purpose: test spark plug performance and ignition strength
3. Application range: 12V gasoline engine automotive spark plugs
4. The dual-hole automotive spark plug tester has two test holes, which can test two spark plugs at the same time. If you suspect that any spark plug is not working properly, you can do a comparative test to make an accurate judgment
5. Test principle: In the automotive ignition system, the high-voltage ignition coil generates a high voltage (more than 10,000 volts), and the spark plug leads it to form a high-voltage ignition coil into the cylinder engine. The spark between the spark plug electrodes ignites the mixture. The detector can distinguish good spark plugs from bad spark plugs according to the intensity of the spark
6. Turn the key switch clockwise to turn on the tester, and the indicator light is green
7. Close the protective cover, insert the adapter into the side socket, and connect the tester to the power supply to turn it on
8. Turn the switch clockwise to adjust the operating frequency between 1000rpm and 6000rpm/min. The higher the frequency setting, the stronger the spark.
9. Dimensions: 145x85x60mm
10. Weight: 354g
Instructions for use of the automotive spark plug tester:
1. Turn off the power before placing the spark plug
2. The spark plug tester is a high-voltage detector. Do not touch the spark plug with your hands during operation to avoid danger
Packing list:
- Spark plug tester x 1
- Power adapter x 1
- User manual (English) x 1
Specification:
| Package Weight |
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Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
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4.9 ★★★★★
Based on 184 reviews
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Product Reviews
★★★★★ 3
Good but heavy smell
Item Package Quantity: 1
I will keep using this bc it works and the sprayer is sooo nice but the smell is so overwhelming. It’s not a bad smell but it’s just so heavy. I’ll use this one but I don’t see myself repurchasing.
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Reviewed in the United States on May 4, 2026
★★★★★ 4
Good but confusing instructions
It is very glowy. After spraying this on my husband commented on why I was sweating so much 😹 I told him it’s my face mist spf. I have very dry and very sensitive skin and this has not broken me out (yet). I’ve used it for about a week now. I don’t know how much sun protection I’m really getting though. And reapplying it all through out the day, esp in the summer will lead to very very oily looking skin.
It’s also confusing because it says do not spray directly onto face. (?) I just hold my breath and close my eyes tightly before I put my mascara on and spray this. So far it’s been helpful with not making my make up look cakey. There is a smell but it’s not a bad smell, slightly fruity and the smell of spf. If you are sensitive to smells this might not be for you.
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Reviewed in the United States on April 5, 2025
★★★★★ 5
Wonderful!
Item Package Quantity: 1
This makes your skin glow. Smells amazing. I’m older and in my 50s and it is great sun coverage and brightener. I will 100% keep using this.
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Reviewed in the United States on June 7, 2026
★★★★★ 5
So refreshing, you’ll forget it’s sunscreen.
This stuff is fantastic. I love the super fine mist and how easily the pump works. It is soo refreshing and smells like fresh coconut. Ot doesn’t sting or burn my sensitive eyes, and it leaves my skin feeling revitalized and moisturized, not sticky or tacky. It feels amazing when it’s hot outside and you need a quick refresh and it won’t disturb my makeup. Coola is becoming one of my favorite sunscreen brands.
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Reviewed in the United States on July 31, 2025
★★★★★ 5
Wonderful hot weather spritz
Size: 1.7 Fl Oz (Pack of 1)
I used this on a recent cruise to the Mediterranean. A lovely spritz on a hot day really was so refreshing! I highly recommend it! And it smells so good!
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Reviewed in the United States on May 3, 2026