{"product_id":"autool-brake-fluid-moisture-tester-as501-digital-brake-fluid-tester-1-8-hd-display-stainless-probe","title":"AUTOOL Brake Fluid Moisture Tester AS501 — Digital Brake Fluid Tester, 1.8\" HD Display \u0026 Stainless Probe","description":"\u003cp\u003e\u003cstrong\u003eAUTOOL AS501 is a handheld digital brake fluid moisture tester that quickly measures water content in DOT brake fluids to help determine when fluid replacement or service is needed.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe AUTOOL AS501 combines a bright 1.8-inch HD backlit LCD with a stainless steel probe and boosted conductivity sensing to deliver fast, repeatable readings for DOT 3, DOT 4, DOT 5, DOT 5.1, ENV-4 and ENV-6 fluids. Lightweight and battery powered, it’s built to live in a technician’s toolbox or a home mechanic’s glovebox so you can verify brake fluid condition in roughly 10 seconds without guesswork.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the AS501 detect moisture in brake fluid?\u003c\/h3\u003e\n\u003cp\u003eThe AS501 uses high-sensitivity conductivity analysis: water changes a fluid’s electrical conductivity, and the tester translates that change into a moisture reading on the display. Its stainless steel probe ensures consistent contact with fluid while resisting corrosion from brake compounds.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConductivity-based sensor for reliable water detection\u003c\/li\u003e\n  \u003cli\u003eStainless steel probe resists corrosion for longer life\u003c\/li\u003e\n  \u003cli\u003eTypical reading time of about 10 seconds per test\u003c\/li\u003e\n  \u003cli\u003eClear numeric results shown on a 1.8\" HD backlit LCD\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich brake fluids and vehicles are compatible with this tester?\u003c\/h3\u003e\n\u003cp\u003eDesigned to work with a wide range of common automotive brake fluids, the AS501 supports DOT 3, DOT 4, DOT 5, DOT 5.1 and newer environmental formulas like ENV-4 and ENV-6. That broad compatibility makes it suitable for most passenger cars, motorcycles, and light trucks encountered in routine maintenance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTests DOT 3, DOT 4, DOT 5, DOT 5.1 fluids and ENV-4\/ENV-6\u003c\/li\u003e\n  \u003cli\u003eWorks for cars, motorcycles, light trucks and fleet vehicles\u003c\/li\u003e\n  \u003cli\u003ePortable for roadside or shop use — battery powered\u003c\/li\u003e\n  \u003cli\u003eUseful for pre-purchase checks and routine inspections\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy is it to use and read results on the AS501?\u003c\/h3\u003e\n\u003cp\u003eOperation is straightforward: power on, insert the probe into a brake fluid sample, and wait for the display to show the moisture percentage or status. The 1.8-inch HD backlit LCD ensures results are readable in bright daylight or low-light conditions, reducing interpretation errors for both pros and DIYers.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSimple one-hand operation for quick tests\u003c\/li\u003e\n  \u003cli\u003eBacklit LCD for easy viewing in any light\u003c\/li\u003e\n  \u003cli\u003eBattery powered by two AA cells for portability\u003c\/li\u003e\n  \u003cli\u003eFast warm-up and immediate results in about 10 seconds\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat durability and support features does the AUTOOL AS501 offer?\u003c\/h3\u003e\n\u003cp\u003eThe AS501 is built with a corrosion-resistant stainless steel flexible probe to withstand repeated exposure to brake fluids, and the low-power electronics extend battery life during field use. Manufacturer support includes a multi-year service period to help maintain long-term reliability.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCorrosion-resistant stainless steel probe for longevity\u003c\/li\u003e\n  \u003cli\u003eLow power consumption — runs on two AA batteries\u003c\/li\u003e\n  \u003cli\u003eFast, repeatable readings reduce diagnostic time\u003c\/li\u003e\n  \u003cli\u003eBacked by a three-year service and technical support plan\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: The AUTOOL AS501 is intended for automotive technicians, fleet managers, motorcycle mechanics and knowledgeable DIYers who want a quick, affordable way to assess brake fluid condition without lab equipment. If you regularly inspect braking systems or perform fluid maintenance, the AS501 provides a compact, reliable tool to help prioritize service and maintain consistent braking performance.\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: How long does a moisture reading take with the AS501?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: A typical test completes in about 10 seconds, showing the result on the HD display.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Which brake fluid types can the AS501 test?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It supports DOT 3, DOT 4, DOT 5, DOT 5.1 and environmental formulas ENV-4 and ENV-6.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"AUTOOL","offers":[{"title":"Default Title","offer_id":48085585494174,"sku":"B0FPDCC1YJ","price":36.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/autool-as501-front-panel-display.jpg?v=1785874004","url":"https:\/\/northtrailauto.ca\/products\/autool-brake-fluid-moisture-tester-as501-digital-brake-fluid-tester-1-8-hd-display-stainless-probe","provider":"North Trail Auto","version":"1.0","type":"link"}