{"product_id":"5-led-brake-fluid-tester-pen-dot3-dot4-dot5-oil-quality-diagnostic","title":"5-LED Brake Fluid Tester Pen – DOT3\/DOT4\/DOT5 Oil Quality Check","description":"\n\u003ch2\u003eKnow Your Brake Fluid's Condition in Seconds\u003c\/h2\u003e\n\u003cp\u003eDon't wait for brake failure to tell you something's wrong. The \u003cstrong\u003eShunmaii 5-LED Brake Fluid Tester\u003c\/strong\u003e gives you an instant, accurate read on the water content in your brake fluid — right from your driveway. Compatible with \u003cstrong\u003eDOT3, DOT4, and DOT5\u003c\/strong\u003e brake fluids, this compact diagnostic pen is an essential safety tool for every driver, mechanic, and car enthusiast.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eMade in Mainland China.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eWhy Water in Brake Fluid Is Dangerous\u003c\/h3\u003e\n\u003cp\u003eBrake fluid is hygroscopic — it naturally absorbs moisture over time. Even a small amount of water lowers the fluid's boiling point, which can cause \u003cstrong\u003ebrake fade, spongy pedal feel, or complete brake failure\u003c\/strong\u003e under heavy use. Regular testing with this pen helps you stay ahead of costly repairs and keeps you and your passengers safe. Learn more about vehicle brake safety from the National Highway Traffic Safety Administration or visit the U.S. Consumer Product Safety Commission for general automotive tool safety guidance.\u003c\/p\u003e\n\n\u003ch3\u003eHow the 5-LED Indicator Works\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e🟢 Green only:\u003c\/strong\u003e Brake fluid is in excellent condition — no water detected.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e🟢🟡 Green + 1 Yellow:\u003c\/strong\u003e Water content \u0026lt;1% — fluid is performing well, no action needed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e🟢🟡🟡 Green + 2 Yellow:\u003c\/strong\u003e Water content ~2% — fluid is still usable; re-test in 6 months.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e🟢🟡🟡🔴 Green + 2 Yellow + 1 Red:\u003c\/strong\u003e Water content ~3% — brake fluid replacement recommended soon.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e🟢🟡🟡🔴🔴 All 5 LEDs:\u003c\/strong\u003e Water content ≥4% — \u003cstrong\u003ereplace brake fluid immediately\u003c\/strong\u003e for your safety.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstant Results:\u003c\/strong\u003e Get a clear water-content reading in seconds — no waiting, no guesswork.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHighly Accurate:\u003c\/strong\u003e Precise electronic sensor delivers reliable diagnostics every time.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility:\u003c\/strong\u003e Works with DOT3, DOT4, and DOT5.1 brake fluids across most vehicle makes and models.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable ABS Construction:\u003c\/strong\u003e Built to handle repeated use in garage and workshop environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBeginner-Friendly:\u003c\/strong\u003e Single-button operation — press, dip the probe, read the LEDs. That's it.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAuto Power-Off:\u003c\/strong\u003e Shuts off automatically after 12 seconds of inactivity to save battery life.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Portable:\u003c\/strong\u003e Pen-style form factor fits easily in a glove box, tool bag, or kit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eShunmaii\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eABS Plastic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eProduct Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e100 × 80 × 50 mm (3.94 × 3.15 × 1.97 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eCompatible Fluids\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eDOT3, DOT4, DOT5 \/ DOT5.1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eIndicator\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e5 LED (Green \/ Yellow \/ Red)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eAuto Power-Off\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e12 seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd;\"\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eHow to Use\u003c\/h3\u003e\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePower On:\u003c\/strong\u003e Press the button — the green LED should illuminate. If it doesn't, replace the battery.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOpen Reservoir:\u003c\/strong\u003e Unscrew the cap on your vehicle's brake fluid reservoir.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDip the Probe:\u003c\/strong\u003e Remove the tester cap and submerge the probe tip into the brake fluid.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRead the LEDs:\u003c\/strong\u003e The lit LEDs instantly show the water percentage in your fluid.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReplace Cap:\u003c\/strong\u003e Securely tighten the brake fluid reservoir cap after testing.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAuto-Off:\u003c\/strong\u003e The tester powers down automatically after 12 seconds.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Brake Fluid Tester Pen\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/100-pack-disposable-nitrile-gloves-latex-free-white-oil-proof\"\u003e100-Pack Disposable Nitrile Gloves – Latex-Free, White, Oil-Proof\u003c\/a\u003e — Keep hands clean when checking fluids.\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/120ml-heavy-duty-metal-rust-remover-anti-rust-coating-spray\"\u003e120ml Heavy-Duty Metal Rust Remover \u0026amp; Anti-Rust Spray\u003c\/a\u003e — Protect metal components under the hood.\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/22awg-glass-tube-fuse-holder-5x20mm-6x30mm-screw-type-10-pack\"\u003e10-Pack 22AWG Glass Tube Fuse Holder 5x20mm \u0026amp; 6x30mm Screw\u003c\/a\u003e — Essential for automotive electrical repairs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Brake_fluid\" target=\"_blank\" rel=\"noopener\"\u003eBrake fluid\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What types of brake fluid is this tester compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: The Shunmaii brake fluid tester is compatible with \u003cstrong\u003eDOT3, DOT4, and DOT5\/DOT5.1\u003c\/strong\u003e brake fluids, making it suitable for the vast majority of passenger cars, trucks, motorcycles, and SUVs on the market today.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How often should I test my car's brake fluid?\u003c\/h4\u003e\n\u003cp\u003eA: Automotive experts generally recommend testing brake fluid quality at least \u003cstrong\u003eonce a year\u003c\/strong\u003e or every 20,000–25,000 miles. If the tester shows a Yellow warning (1.5%–3% water content), re-test after six months. If Red LEDs light up (water content ≥3%), replace the brake fluid immediately for safe braking performance.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Do I need any technical skill to use this brake fluid tester?\u003c\/h4\u003e\n\u003cp\u003eA: Not at all! The single-button operation and intuitive 5-LED color display make it simple for \u003cstrong\u003ebeginners and professionals alike\u003c\/strong\u003e. Just press the button, dip the probe into the brake fluid, and read the colored LEDs — the whole process takes under 30 seconds.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What does it mean when all 5 LEDs light up?\u003c\/h4\u003e\n\u003cp\u003eA: When all five LEDs (green, two yellows, and two reds) are illuminated, your brake fluid has a \u003cstrong\u003ewater content of 4% or higher\u003c\/strong\u003e. This is a critical threshold — you should replace your brake fluid immediately, as excessively contaminated fluid significantly reduces braking effectiveness and can be dangerous.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What types of brake fluid is this tester compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The Shunmaii brake fluid tester is compatible with DOT3, DOT4, and DOT5\/DOT5.1 brake fluids, making it suitable for the vast majority of passenger cars, trucks, motorcycles, and SUVs on the market today.\"}}, {\"@type\": \"Question\", \"name\": \"How often should I test my car's brake fluid?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Automotive experts generally recommend testing brake fluid quality at least once a year or every 20,000–25,000 miles. If the tester shows a Yellow warning (1.5%–3% water content), re-test after six months. If Red LEDs light up (water content ≥3%), replace the brake fluid immediately for safe braking performance.\"}}, {\"@type\": \"Question\", \"name\": \"Do I need any technical skill to use this brake fluid tester?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Not at all! The single-button operation and intuitive 5-LED color display make it simple for beginners and professionals alike. Just press the button, dip the probe into the brake fluid, and read the colored LEDs — the whole process takes under 30 seconds.\"}}, {\"@type\": \"Question\", \"name\": \"What does it mean when all 5 LEDs light up?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"When all five LEDs (green, two yellows, and two reds) are illuminated, your brake fluid has a water content of 4% or higher. This is a critical threshold — you should replace your brake fluid immediately, as excessively contaminated fluid significantly reduces braking effectiveness and can be dangerous.\"}}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"spain","offer_id":47710840848489,"sku":"200007763:201336104","price":17.04,"currency_code":"USD","in_stock":true},{"title":"Australia","offer_id":47710840881257,"sku":"200007763:201336099","price":20.29,"currency_code":"USD","in_stock":true},{"title":"france","offer_id":47710840914025,"sku":"200007763:201336342","price":20.17,"currency_code":"USD","in_stock":true},{"title":"United States","offer_id":47710840946793,"sku":"200007763:201336106","price":24.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7931\/3257\/files\/S00a9d362ba674755b33cad761738b2e2C.webp?v=1782060863","url":"https:\/\/oasis-select.com\/products\/5-led-brake-fluid-tester-pen-dot3-dot4-dot5-oil-quality-diagnostic","provider":"Oasis Select","version":"1.0","type":"link"}