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Ships within 48 hours · Estimated delivery Jul 27 - Aug 1
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Description
DUOYI DY23B Car Brake Fluid Detection Pen Moisture Tester, DY23B1. Brake pressure was transmitted by brake fluid, the pressure transmission will out of function once brake fluid including too much water. In order to safe driving, we must test water ratio scale in brake fluid regularly. The brake fluid tester help us do current maintenance, make sure we drive in safety condition. 2. HD backlight dual display, support backlight display glare and easy reading day and night. 3. Operation Manual: (1). Install one
1. Brake pressure was transmitted by brake fluid, the pressure transmission will out of function once brake fluid including too much water. In order to safe-driving, we must test water ratio scale in brake fluid regularly. The brake fluid tester help us do current maintenance, make sure we drive in safety condition.2. HD backlight dual display, support backlight display glare and easy reading day and night.
3. Operation Manual:
(1). Install one 9V(6F22) battery at the back of tester.(not included)
(2). After inserting the battery, press POWER button to turn on the tester, all LEDs lights turn on with buzzer sounding, which indicates the product self-test is successful.
(3). Press SELECT button, it will locate DOT3 model automatically.
(4). Each time you push the SELECT button, it will recycle from DOT3 to DOT4 to DOT5.1 with the indicator LEDs.
(5). Immerse the probe into brake fluid and you will get different colors of LED lights, they indicate:
Green Light: indicates the brake fluid water content is below 1%
The First Yellow Light: indicates the brake fluid water content is approximately 1.5%
The Second Yellow Light: indicates the brake fluid water content is approximately 2.5%
The First Red Light: indicates the brake fluid water content is approximately 3%
The Second Red Light: indicates the brake fluid water content is more than 4%
(6). Press POWER button to turn off the tester.
4. Note:
(1). After use, please clean the probe and avoid any retention of stains that might affect the test.
(2). If in use for a long time, best to remove all batteries and store in a dry place at normal room temperature.
5. Package include:
Brake fluid tester x 1
User manual x 1
Specification:
| Package Weight |
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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
4.1 ★★★★★
Based on 21 reviews
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Product Reviews
★★★★★ 5
New favorite moisture serum
I am blown away by this formula - it goes on silky and absorbs into the skin, giving it a plump, hydrated glow without ANY stickiness or annoying shine. Two pumps after cleansing and toner is just right but you can also go in heavier and use in place of a moisturizer. This truly gives me lasting moisture, which is amazing for a light to mid-weight serum. Wears great with other complexion products and under makeup. The glass bottle is luxe and the pump isn't the least bit messy. Glycerin is all the rage in terms of "hot" ingredients right now - and I have to say after using this, I'm a believer. I've pretty much replaced a classic daily moisturizer with pairing this serum before Strata Lipid Gold (another holy grail) - which works great under my moisturizing Japanese sunscreen (Canmake Mermaid Skin). These steps provide a flawless, juicy base under makeup for my maturing (43-year old) skin. Can't wait to try more products in this line.
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Reviewed in the United States on September 29, 2024
★★★★★ 4
Good
Moisturizing and gel like. It pills when used with the Prequel mineral SPF.
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Reviewed in the United States on March 31, 2026
★★★★★ 5
LOVE
I love this stuff, doesn't irritate my skin and one pump goes a long way. I like to apply it right out of the shower with some rose hydrosol so my skin can soak it right up. Has a great plumping effect and doesn't irritate sensitive eye or lip areas. The glass bottle is a must for me and the pump is a nice added bonus. Also nice that it is made in the US. No strong scents or any fragrance, lasts me a long time too so the price isn't too bad. I'm new to this brand but am absolutely loving it so far!
If Prequel is reading this, PLEASE start using aluminum or glass pump bottles for your face cleansers and offer cheaper refills in packets- I'm sure there are plenty of people who would be willing to pay a bit more for the bottle and then less for a refill. Maybe the cost would even out? I love being able to keep your glass bottles and I hate having to throw out these plastic bottles. Just a thought...
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Reviewed in the United States on January 15, 2026
★★★★★ 5
Great product!
Super nice. Does not dry sticky or like “egg whites” on your face. Is very hydrating and comfortable. Great for sensitive skin too.
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Reviewed in the United States on April 28, 2026
★★★★★ 5
AM & PM Staple!
If you’re looking for a product that actually hydrates and has a bare bones ingredients list, this is it. I have very sensitive, pale skin that’s been even drier since starting tretinoin, and this serum has been amazing. The first time I used it, I saw a noticeable difference in the fine lines. It hydrates even more when I apply it while my face is still wet, and I don’t have to worry about it reacting with other products in my routine. It has no smell, and two pumps is all I need so the bottle has lasted a few months. Now a staple in my AM and PM routine.
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Reviewed in the United States on April 23, 2026