Fixing a BAD DEF that is obsolete can cost you $2000. To make sure I wasn't adding that crappy DEF to my 6.7 liter truck, I bought this unit to make sure it had a good DEF. It's pretty darn easy to use and every time I fill up I check the DEF with this refractometer to make sure it's still good.
Nitro-Style Draft Beer Dispenser - FIZZICS DraftPour, Perfect Gift For Homebrewers & Craft Beer Enthusiasts!
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