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Your cart is empty.The Performance Tool W16500 Professional DEF Tester is a must-have tool for anyone who wants to accurately test the purity levels of their DEF. Using floating discs, this tester provides highly accurate readings of the urea levels in your DEF, whether it's hot or cold. Designed for use with most diesel-powered cars, light duty trucks, and semi-trucks manufactured from 2010 to present day, this DEF tester is suitable for various vehicles. It's easy to use - simply insert the disc into your DEF tank and watch as it accurately displays the urea levels, allowing you to easily monitor your vehicle's DEF purity. This DEF tester is temperature compensating, ensuring that you get accurate readings regardless of the ambient temperature. The Performance Tool W16500 is a professional disc-type DEF tester that is trusted by mechanics and technicians to deliver accurate and reliable results every time.
David
2025-08-19 10:59:43
Def quality tester works as it should
Chuck
2025-08-11 18:55:33
I'm not sure I would buy again for several reasons: I doubt that the 3 balls are going to have enough resolution to determine if DEF is just slightly out of spec. Two- the long hose, won't reach the DEF in my 22 Silverado unless the tank was very full, so it's just not that useful. Will it test DEF in a jug, sure.
Mark Longo
2025-07-25 16:41:46
You can spend ten times as much for a more technical tool and if your doing research, you should do so. I had purchased two jugs of DEF from WalMart as I had ten times before with oil to do an LOF on my BMW M57Y motor. Shortly after adding it to my tank, I received a msg telling me that I had 200 miles before my engine would not start and had to be reset by the dealer. My independent mechanic told me to test it and recommended that I purchase this to do so. While they drained my system and refilled it, I tested the bottle of what was left and wouldn't you know...I would have saved myself several hundred dollars had I just tested it before I put it in. Now I'm fighting WalMart and their manufacturer for reimbursement.
Megafreakintron
2025-07-21 14:03:26
so i wanted to check my antifreeze. so i looked for an awsome antifreeze checker do Hickie. and put one on my wishlist. well, the wife decided to clean off my wishlist because i had to many unneeded things. after she deleted everything we had the blizzard of 2022 and there were no antifreeze checkers in any auto parts store on the planet. so she panics goes to amazon and orders me this. the amazing thing i cannot use. well until the zombie apocalypse then i will need it for killing zombies. great job. looks high quality through the plastic. and the little disks slide around when i jiggle it like a rattle. keep up the good work...
Anne Archambault
2025-06-30 13:48:00
Does as advertised.
Ernest V. Russell
2025-06-26 09:56:30
Arrived broken but useable. However, when compared to other testers mine said the DEF was bad. The DEF was new and other testers confirmed it was good. I waited too long to return it.
Mike C.
2025-05-02 13:01:47
Diesel mechanic. Use this tool as a quick test tool. Works great and handy. Make sure you rinse and flush with water after use to keep DEF from crystallizing inside of it.
Pat Patterson, CSP
2025-04-20 11:41:42
Easy to use
Customer
2025-03-08 18:44:19
I needed to know if my def was good or not. This device was easy to use
Kathy
2025-03-03 10:24:15
I had a few containers of DEF and was worried about them being past the expiration date so purchased this item and was relieved to find all containers still read “Goodâ€. Well worth it!
Usta
2025-02-24 15:34:42
Practical working good. Easy to use
J.Brown
2025-02-04 11:55:30
Works good , bought 2 for my shop it works well and helps with repairs to DEF systems
Alex J.
2025-01-02 10:48:54
Easy to use, although markings could be clearer. Important for all DEF vehicles that could suffer malfunctions and check engine lights if old DEF is used.
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