Prestone AF-1420-6PK Antifreeze/Coolant Tester, (Pack of 6)

Works great, and for a good price relative to others. Takes just a little practice to get it full by squeezing the bulb--no big deal. Highly recommend.

This thing is so handy and inexpensive to purchase everybody should have one. Not only for mechanics, everyone should have one of this unless you never touch under the hood of your car. Makes it simple to check the concentration of coolant once you have mixed your own or done a coolant change and are replacing your coolant. Super easy to use and is cheap made but has lasted so far with multiple uses. Its easy to read and tell the concentration of the coolant mix in your system.

I doubt this is particularly precise but I’d argue high precision not particularly required for testing anti freeze. Is tremendously easy to use and worth having even if you have a shop do the antifreeze replacement work because I found in my case my shop left me tremendously under protected after some radiator work. Rinse it out after use or it won’t last long term.

My old Mac Tools Coolant tester finally failed after 25 plus years. I was hesitant about the quality of the rubber hose and pump on the newer testers. Not working in the automotive field anymore, I didn't have access to the Mac tool truck or Snap 0n, etc. I figured with any manufacturer, the quality won't be the same as it was decades ago as far as the rubber goes. Just my thoughts. I purchased this coolant tester from Prestone a while ago now, and it has performed very well. The reading is the almost exactly the same as on my neighbors Mac tools newer tester, and the rubber quality seems good as well. How long it will last only time will tell, but I am happy that the quality was better than I expected it to be. I only give it four stars as the rubber parts are a bit stiffer and thinner than my old Mac Tools coolant tester, but they are still are solid and flexible enough to seem well built.

It does what it is supposed to do. There is not too much else to say. It is pretty simple to use.

Good

Low cost option to see if your antifreeze is up to Par. Easy to read. Sturdy.

Works fine and good quality.

I bought this to check the coolant in my marine engine, where leaks could have diluted the coolant and negated its protective effect. Easy to use: pump a little coolant using the attached hand-pump, and read off the level of protection based on the density of the coolant. Reliable, simple, no electronics needed, and reusable. Really a neat tool to have in colder climates, and when you don't know if your coolant was ever diluted with water.

Not..

Suitable price, effective device, and reliable.

Tested on radiator successfully, it’s works perfectly

Does what it's supposed to do... an easy to use tester..that anyone can use..