Do you know of a refractometer that measures the shelf-life of DEF? I’m not as concerned about our contamination as I am the risk. I’ve heard that comes from it sitting idle in a tank for too long.
A Diesel Exhaust Fluid (DEF) refractometer cannot tell you the quality or shelf-life of the DEF, it can only provide you a measure of urea concentration. However, a concentration measurement can tell you if the DEF is over or under concentrated, and may indicate tampering. The MISCO DEF201 and DEF202 digital handheld refractometers can measure the concentration of urea in DEF but this is a measure of concentration only.