Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 14 - Jul 19
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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:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
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
4.6 ★★★★★
Based on 711 reviews
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Product Reviews
★★★★★ 3
thinner
It's thinner than it's described.
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Reviewed in the United States on January 29, 2025
★★★★★ 5
Buy the comforter!
Absolutely love this comforter. It’s super fluffy! Definitely buy it! You won’t regret it.
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Reviewed in the United States on January 1, 2026
★★★★★ 5
Really warm
This is well made and very warm. I’ve had down comforters for years and needed a new one. Great price point for a California King. Came quickly.
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Reviewed in the United States on February 12, 2025
★★★★★ 5
Saved me so much money
Im loving this mattress topper. It has added a noticeable layer of comfort to my firm mattress without making it feel too soft. The cushion is plush yet supportive and has made sleeping more comfortable overall.
The bamboo feels soft and breathable. It fits on the mattress with the deep pockets and stays in place alk night. Setup was easy and it fluffed up after unpacking.
If you have a firm mattress and want extra comfort without replacing it, this topper is a great option. Highly recommend
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Reviewed in the United States on December 29, 2025
★★★★★ 5
Comfortable, cooling, and OEKO-TEX certified, it’s a great way to refresh any mattress.
This 3-inch mattress topper instantly upgraded my bed with a softer, cooler, and more supportive feel. The bamboo-viscose fabric is noticeably breathable, helping regulate heat throughout the night—great for hot sleepers. The 1200GSM down-alternative fill adds plush, cloud-like cushioning while still offering balanced support for the back and shoulders. It fits securely with the deep pockets and stays in place even when turning. After allowing it to fully expand, the topper fluffs up beautifully. Comfortable, cooling, and OEKO-TEX certified, it’s a great way to refresh any mattress.
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Reviewed in the United States on December 8, 2025
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