The Thexton Professional DEF-Tester (108) is an essential tool for maintaining the health and performance of your diesel vehicle. Designed specifically to measure the urea concentration in Diesel Exhaust Fluid (DEF), this tool helps prevent common issues caused by incorrect fluid. Since 2010, most diesel vehicles have been equipped with a DEF tank as part of their Selective Catalytic Reduction (SCR) system. The effectiveness of this system depends on the fluid having a precise urea concentration, typically 32.5%. If the concentration is off, even by a small amount, it can lead to poor performance and potentially cause expensive damage to your vehicle’s injectors and catalytic converter. The Thexton DEF-Tester provides a simple, reliable way to verify the fluid’s quality, giving you peace of mind and protecting your investment. Its straightforward design makes it easy for both professional technicians and vehicle owners to use.KEY FEATURES AND BENEFITS: Accurately measures urea concentration in Diesel Exhaust Fluid (DEF). Temperature-compensating discs: Ensure precise readings in both hot and cold DEF. Clear convex plastic barrel: Magnifies readings for easy and accurate viewing. Helps prevent clogged injectors and damage to the catalytic system. Simple design suitable for professionals and vehicle owners alike. Cost-effective preventative maintenance tool to avoid expensive repairs.SPECIFICATIONS: Model Number: 108 or THX108 Length: 16-1/4 inches Included in purchase: Single-piece DEF tester with barrel, internal discs, and one-piece bulb with neoprene dip tubeHOW TO USE: Prepare the Tool: Ensure the tester is clean and ready for use. Insert into Tank: Place the neoprene dip tube into the DEF tank. Draw Fluid: Squeeze and release the rubber bulb to pull DEF into the barrel. Wait for Stabilization: Hold upright and allow discs to float and stabilize. Read the Concentration: Count the floating discs and compare with the reference chart to confirm proper concentration (typically 32.5%). Clean and Store: Drain DEF back into the tank, rinse the tester with water, and store it in a dry place.BENEFITS OF USING THEXTON PROFESSIONAL DEF-TESTER (108): Ensures DEF quality for proper emissions system performance. Prevents harmful deposits that can clog injectors and damage the catalytic converter. Improves engine efficiency and reduces the risk of costly repairs. User-friendly design allows both professionals and vehicle owners to take accurate readings. Reliable preventative tool to protect your diesel vehicle investment.FEATURES: Provides accurate results in both cold and hot DEF testing. Equipped with a durable bulb and neoprene dip tube for easy sampling. Magnified clear barrel for simple disc visibility and reading. Lightweight, portable design for convenience in workshops or vehicles. Built from long-lasting, high-quality plastic for extended service life. Proudly manufactured in the USA.