Overall pick
Prestone

Prestone® Antifreeze & Coolant Tester

4.6 stars out of 307 reviews
(4.6)|
307 ratings

Key item features

  • Professional Testing: This do-it-yourself tester accurately gauges antifreeze/anti-boil protection, making it suitable for both car owners and professional mechanics.
  • Visual Inspection: The tester facilitates visual inspection for rust and sediment, enabling early detection of potential issues.
  • Effortless Operation: Designed for convenience, this tester is easy to use and provides clear, readable results.
  • Universal Compatibility: It works with all ethylene and glycol coolants, including Prestone GM, Dex-Cool, and 5/150 Extended Life Antifreeze Coolant.
  • Simple Maintenance: The tester rinses clean effortlessly with hot water after use.
  • Compact Dimensions: With a size of 6x9 inches, the tester is a practical and manageable tool.
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Customer ratings & reviews

4.6 out of 5 stars
stars307 ratings95 reviews
How item rating is calculated
  1. 5 stars81% (250)
  2. 4 stars9% (28)
  3. 3 stars3% (9)
  4. 2 stars2% (5)
  5. 1 star5% (15)

Reviews summary

Pros
  • : Offers lower price point compared to similar products.
  • : Operates with minimal effort and intuitive controls.
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Showing 1-3 of 95 reviews

Jan 14, 2026
Susan
Top Reviewer
5 out of 5 stars review

Verified Purchase

Just my opinion being a girl in all but being by myself and eating something like this it comes in pretty handy. Have used mine twice this winter already just to be on the safe side.

Helpful?7BMJT8USK1OH16817506
Dec 17, 2025
Kendra
Top Reviewer
5 out of 5 stars review

Verified Purchase

IF YOU DON'T HAVE ONE, YOU NEED TO GET ONE

This was easy to understand easier to read cheap and necessity so your car don't mess up in the winter time but definitely recommend if you don't have one. You need to get one..

Helpful?7BMJT8USK1OH16817506
Jan 11, 2025
FormerlyStJohn
5 out of 5 stars review

Verified Purchase

Very effective for the price. Fairly difficult to remove from the packaging but once out easy to use. Read the short instructions before using. The old used car I bought for my son had NO measurable antifreeze in it, evidently just water. Very important to know before an upcoming freeze.

Helpful?7BMJT8USK1OH16817506