{"product_id":"otc-diesel-exhaust-fluid-refractometer-kit-5025-portable-def-tester-calibrated-for-32-5-urea-field-ready-with-case","title":"OTC Diesel Exhaust Fluid Refractometer Kit 5025 — Portable DEF tester, calibrated for 32.5% urea, field-ready with case","description":"\u003cp\u003e\u003cstrong\u003eThe OTC 5025 Diesel Exhaust Fluid (DEF) Refractometer Kit is a handheld optical tester that quickly verifies DEF concentration to the industry-standard 32.5% urea solution.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis compact refractometer gives technicians and drivers a fast, reliable way to confirm Diesel Exhaust Fluid strength before adding it to selective catalytic reduction (SCR) systems. Built for field or shop use, the kit helps you spot off-spec DEF that could impair emissions control components or trigger fault codes. It’s calibrated for the DEF range most relevant to heavy-duty diesel applications and includes the accessories needed to take immediate readings.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this refractometer determine DEF concentration?\u003c\/h3\u003e\n\u003cp\u003eLight passing through a small sample on the prism is refracted; the instrument magnifies that refraction so you can read concentration on a built-in scale. The more urea present, the greater the light bending, and the higher the scale reading. Readings are temperature-referenced to provide consistent results at the kit’s specified conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOptical prism and reticle display concentration precisely\u003c\/li\u003e\n  \u003cli\u003eScale graduated in 0.5% increments with 32.5% marked for DEF\u003c\/li\u003e\n  \u003cli\u003eIndicated scale covers 15–40% plus a water line for quick checks\u003c\/li\u003e\n  \u003cli\u003eCalibrated for readings near 20°C for consistent accuracy\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat comes in the OTC 5025 kit and how do I use it?\u003c\/h3\u003e\n\u003cp\u003eThe kit is ready for immediate field checks and includes the refractometer plus practical tools to take and clean samples. Using it requires only a few drops of DEF on the prism, closing the cover plate, and viewing through the eyepiece to read the reticle. A small screwdriver allows zero adjustment if necessary, and the quick guide walks you through common troubleshooting steps.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRefractometer body with prism and eyepiece\u003c\/li\u003e\n  \u003cli\u003eDropper for controlled sample application\u003c\/li\u003e\n  \u003cli\u003eLens wipe for prism cleaning and a protective carrying case\u003c\/li\u003e\n  \u003cli\u003eInstructions, quick reference guide, and calibration screwdriver\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy does confirming 32.5% matter for diesel vehicles?\u003c\/h3\u003e\n\u003cp\u003eModern heavy-duty diesel engines using SCR require DEF of the correct urea concentration to function within emissions regulations. Off-spec or diluted DEF can reduce SCR performance and may lead to diagnostic trouble codes or reduced system efficiency. Regular checks help maintain emissions control and protect downstream components like dosing pumps and catalysts.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEnsures DEF meets the 32.5% urea\/water concentration commonly specified\u003c\/li\u003e\n  \u003cli\u003eHelps prevent SCR-related faults and performance issues\u003c\/li\u003e\n  \u003cli\u003eSuits fleet managers, technicians, and drivers who refill DEF in the field\u003c\/li\u003e\n  \u003cli\u003eUseful for verifying bulk dispenser accuracy at fuel sites\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow accurate and practical is this tool for everyday use?\u003c\/h3\u003e\n\u003cp\u003eThe OTC 5025 is a portable, optical device designed for straightforward, repeatable checks rather than laboratory-grade analysis. It provides clear pass\/fail information around the target 32.5% concentration and is small enough to keep in a service truck or toolbox. Proper sample handling and periodic calibration will keep results consistent over time.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePortable and lightweight for on-road or shop inspection\u003c\/li\u003e\n  \u003cli\u003e0.5% graduation for meaningful resolution near the target value\u003c\/li\u003e\n  \u003cli\u003eSimple maintenance: keep the prism clean and adjust zero as needed\u003c\/li\u003e\n  \u003cli\u003eIncludes a protective case for transport and storage\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The OTC 5025 kit is intended for fleet managers, diesel technicians, owner-operators, and fueling station staff who need a fast, portable way to verify DEF quality. It’s particularly useful for heavy-duty Class 7–8 diesel applications that rely on SCR systems from manufacturers such as Detroit Diesel, Cummins, PACCAR, and Volvo\/Mack. If you refill DEF on the road, maintain multiple trucks, or oversee bulk DEF dispensing, this kit helps you confirm fluid concentration before it enters the vehicle system.\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: Can this refractometer check DEF right at the pump?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It’s portable and designed for field use so you can sample DEF from dispensers or bottles and get immediate concentration readings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How small a sample does the OTC 5025 need?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Only a few drops placed on the prism are required for an accurate reading when used per the included instructions.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"OTC","offers":[{"title":"Default Title","offer_id":48080169566366,"sku":"B0054WI5KQ","price":190.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/otc-5025-refractometer-front.jpg?v=1785779482","url":"https:\/\/northtrailauto.ca\/products\/otc-diesel-exhaust-fluid-refractometer-kit-5025-portable-def-tester-calibrated-for-32-5-urea-field-ready-with-case","provider":"North Trail Auto","version":"1.0","type":"link"}