$21.99 Refractometer for Battery, Anti-freeze, and DEF
Check out this $21.99 refractometer on Amazon. Lotta bang for the buck. Received it yesterday. Seems reasonably well-made and appears to work as advertised.
Forum Discussion
pigman1 wrote:If your refractometer can measure a battery's specific gravity (and the freeze point of antifreeze), I'm guessing it should be able to measure DEF, too. The refractometer only measures the concentration percentage of soluble solids dissolved in the water. The concentration percentage of usable urea is within the concentration percentage range of battery acid's specific gravity.
First class. I have one that measures battery specific gravity and antifreeze freeze point but the DEF feature is a worthwhile addition. Thanks.
According to my refractometer (with a urea scale), a sample of DEF will read approx. 1.31 on the battery specific gravity scale if the urea concentration is 32.5 percent (ideal). Approx. 1.33 if the urea is high at 34 percent, and approx. 1.29 if the urea is low at 31 percent. I believe the urea concentration percentage tolerance for Cummins is +/- 1.5 percent or 31 - 34 percent.
