{"product_id":"otc-refractometer-kit-for-diesel-exhaust-fluid-def-15-40-range-portable-def-tester-0-5-accuracy","title":"OTC Refractometer Kit for Diesel Exhaust Fluid (DEF) 15–40% Range — Portable DEF Tester, 0.5% Accuracy","description":"\u003cp\u003e\u003cstrong\u003eThe OTC 5025 Refractometer Kit is a handheld optical tester that quickly checks Diesel Exhaust Fluid (DEF) concentration to confirm the proper 32.5% urea solution for SCR systems.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eKeep SCR-equipped diesel engines running within manufacturer and regulatory guidelines by verifying DEF strength on the spot. This compact refractometer uses light refraction across a prism and a magnified reticle to display concentration readings, letting drivers and technicians detect off-spec DEF before it affects emissions control systems.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the refractometer determine DEF concentration?\u003c\/h3\u003e\n\u003cp\u003eThe instrument measures how much light bends when passing through a DEF sample on the prism. That bending corresponds to a position on the internal reticle, which is calibrated to show percentage concentration specifically for DEF solutions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePlace a few drops of DEF on the prism using the supplied dropper\u003c\/li\u003e\n  \u003cli\u003eClose the cover, hold the eyepiece to your eye and point toward light\u003c\/li\u003e\n  \u003cli\u003eRead the concentration on the reticle scale, accurate to 0.5%\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat readings and range should I expect from this kit?\u003c\/h3\u003e\n\u003cp\u003eThe scale is marked with a clear waterline and covers a practical DEF range for fleet maintenance. The instrument is graduated in 0.5% increments and highlights the critical 32.5% target used by SCR systems.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIndicated scale from 15% to 40%\u003c\/li\u003e\n  \u003cli\u003eGraduations at 0.5% for precise checks\u003c\/li\u003e\n  \u003cli\u003eClear 32.5% reference marking for standard DEF\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat comes in the OTC 5025 kit and how durable is it?\u003c\/h3\u003e\n\u003cp\u003eThe kit includes everything needed to take immediate measurements and maintain the instrument in the field. Components are packaged in a protective case for transport and on-site use.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRefractometer calibrated for DEF concentrations\u003c\/li\u003e\n  \u003cli\u003ePlastic dropper, lens cloth, screwdriver and instructions\u003c\/li\u003e\n  \u003cli\u003eHard case for storage and safe transport\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy test DEF instead of assuming bottled or bulk fluid is correct?\u003c\/h3\u003e\n\u003cp\u003eDEF quality can degrade from contamination, dilution or improper storage, which may lead to off-spec urea concentrations. Periodic spot checks help avoid SCR malfunctions, costly diagnostics, or downtime attributable to incorrect DEF composition.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDetects diluted or contaminated fluid before it enters the SCR system\u003c\/li\u003e\n  \u003cli\u003eSimple process suitable for drivers or shop techs without lab equipment\u003c\/li\u003e\n  \u003cli\u003eQuick verification at truck stops, depots, or fuel islands\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: The OTC 5025 Refractometer Kit is designed for fleet managers, diesel technicians, owner-operators and roadside personnel who need a fast, portable way to confirm DEF meets the 32.5% urea\/water standard used by most modern heavy-duty SCR engines. If you service Detroit, Cummins, PACCAR, Volvo, Mack or similar diesel platforms and want a reliable field test to avoid emissions issues and unnecessary repairs, this kit provides a compact, accurate solution.\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 the OTC 5025 measure DEF accurately on-site?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It provides field-accurate readings with 0.5% graduations and a calibrated 32.5% reference for DEF checks.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What items are included in the refractometer kit?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The kit contains the refractometer, dropper, lens cloth, screwdriver, instructions, quick guide and a protective case.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"OTC","offers":[{"title":"Default Title","offer_id":55170447376727,"sku":"B0054WI5KQ","price":156.64,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/otc-5025-refractometer-front.jpg?v=1790429422","url":"https:\/\/britishgarage.co.uk\/products\/otc-refractometer-kit-for-diesel-exhaust-fluid-def-15-40-range-portable-def-tester-0-5-accuracy","provider":"British Garage","version":"1.0","type":"link"}