$2 $17
Amazon has the Prestone AF-1420 Antifreeze / Coolant Tester for $2 with free shipping on orders $49+ or with Prime. Walmart has it for the same price.

Easily tests for anti-freeze/anti-boil protection and allows visual inspection for rust and sediment.
$2 retail: $17
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Comments & Reviews (4)

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suednim
Ben's cred: 446
Posted 04/14/2016 at 09:36 PM PT
Posted 04/14/2016 at 09:36 PM PT
Effing POS. May work for a while but will break soon or leak.
Bpullman
Ben's cred: 45
Posted 04/15/2016 at 05:45 AM PT
Posted 04/15/2016 at 05:45 AM PT
Be sure to select
Amazon
Prime as the seller (out of stock for now). The listing that comes up 1st has $6 shipping.
Crash And Burn
Ben's cred: 574
Posted 04/15/2016 at 09:45 AM PT
Posted 04/15/2016 at 09:45 AM PT
Since it doesn't say temperature compensating I would assume it doesn't. You want one that does. I'm old school and like this style: http://www.walmart.com/ip/40860351?wmlspartner=wlpa&adid=22222222227028421785&wl0=&wl1=g&wl2=c&wl3=61175471169&wl4=&wl5=pla&wl6=96562309929&veh=sem
Some disc types claim to be temp compensating but I'm skeptical.
dave_c
Ben's cred: 5862
Posted 04/15/2016 at 01:16 PM PT
Posted 04/15/2016 at 01:16 PM PT
Have one, came free with a gallon of AF a few years back but have never used it. No need, I always add coolant in the prescribed ratio. If I had a radiator leak and found myself topping off with water on the road it might be a different story.