{"product_id":"kaiweets-brake-fluid-tester-pen-with-corrosion-resistance","title":"KAIWEETS Brake Fluid Tester Pen with Corrosion Resistance","description":"\u003cb\u003eKAIWEETS Brake Fluid Tester Pen quickly measures moisture in DOT3, DOT4 and DOT5.1 brake fluids and alerts you when humidity reaches unsafe levels.\u003c\/b\u003e\n\n\u003cp\u003eKeeping brake fluid moisture low is essential for dependable stopping power. The KAIWEETS Brake Fluid Tester Pen is a compact, battery-powered diagnostic tool with a corrosion-resistant probe, three-color backlight, buzzer alarm and data-hold so you can test reservoir fluid on the vehicle or the bench and record clear, repeatable results.\u003c\/p\u003e\n\n\u003ch3\u003eHow fast and accurate are the readings?\u003c\/h3\u003e\n\u003cp\u003eThis tester delivers rapid measurements across a 0%–4% moisture range with high repeatability and a specified precision around ±0.3%. Readings appear instantly on the display and can be locked with the data-hold button so you can note values before moving on.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMeasurement range: 0%–4% water content\u003c\/li\u003e\n  \u003cli\u003eStated accuracy: about ±0.3%\u003c\/li\u003e\n  \u003cli\u003eData-hold stores the current reading for review\u003c\/li\u003e\n  \u003cli\u003eInstant on-screen result for quick checks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill it tell me when the fluid needs changing?\u003c\/h3\u003e\n\u003cp\u003eYes — the unit includes both visual and audible alerts that trigger when moisture exceeds a safety threshold. A three-color backlight gives immediate visual status while the buzzer provides an unmistakable alarm if contamination is too high.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eColor-coded backlight shows safe, caution, and alarm zones\u003c\/li\u003e\n  \u003cli\u003eBuzzer sounds when humidity passes the preset safety limit (about 3%)\u003c\/li\u003e\n  \u003cli\u003eReadable in low light thanks to the illuminated display\u003c\/li\u003e\n  \u003cli\u003eSettings calibrated for DOT3, DOT4 and DOT5.1 brake fluids\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs the probe and construction durable for workshop use?\u003c\/h3\u003e\n\u003cp\u003eDesigned for repeated testing, the probe is treated for corrosion resistance so it stands up to brake fluid exposure. The compact housing is portable and suited to both shop and DIY garages, and the device runs on common AAA batteries for convenient power replacement.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCorrosion-resistant probe for longer service life\u003c\/li\u003e\n  \u003cli\u003eTwo AAA batteries power the tester for field use\u003c\/li\u003e\n  \u003cli\u003eCompact form factor fits toolboxes and pockets\u003c\/li\u003e\n  \u003cli\u003eOperates reliably within typical garage temperatures\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I use it safely with different brake fluids?\u003c\/h3\u003e\n\u003cp\u003eIdentify the brake fluid type first (DOT3, DOT4 or DOT5.1) and ensure the tester is calibrated for that class before probing the reservoir. Avoid contaminating the reservoir: insert the probe briefly, read the displayed percentage, then clean the probe after each use to maintain accuracy.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConfirm fluid type before testing (DOT3\/DOT4\/DOT5.1)\u003c\/li\u003e\n  \u003cli\u003eInsert probe briefly into the fluid surface to measure\u003c\/li\u003e\n  \u003cli\u003eUse data-hold to capture the reading before removing\u003c\/li\u003e\n  \u003cli\u003eWipe or rinse probe after each test to prevent residue buildup\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: The KAIWEETS Brake Fluid Tester Pen fits professional technicians, mobile mechanics and car owners who prefer proactive maintenance. If you perform routine brake inspections or want a simple, portable way to verify reservoir moisture and avoid premature fluid degradation, this tester provides quick, documented results and helpful alarms to prioritize brake system service.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Which brake fluid types does this pen test?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It is calibrated to test DOT3, DOT4 and DOT5.1 brake fluids accurately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What happens when moisture exceeds the safe limit?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: A three-color backlight and a buzzer alarm activate when moisture passes the preset safety threshold.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"KAIWEETS","offers":[{"title":"Default Title","offer_id":48087271571614,"sku":"B0D9M279V9","price":34.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/kaiweets-brake-fluid-tester-front-view.jpg?v=1785919849","url":"https:\/\/northtrailauto.ca\/products\/kaiweets-brake-fluid-tester-pen-with-corrosion-resistance","provider":"North Trail Auto","version":"1.0","type":"link"}