Bead-Type Anti-Freeze Coolant Tester

Marsoni

M251S

$30.99

Get it in 3 business days with 1 day shipping. Friday, May 29

Bead-Type Anti-Freeze Coolant TesterThis Bead Type Anti Freeze Coolant Tester is a professional tool that measures specific gravity of glycol. It is fast and easy to use, with a number of floating beads indicating the degree of protection, making it an essential tool for any automotive technician. Specifications Part Number 4102

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They feel sturdy yet remain pleasantly soft on the skin during use. Keep in mind that they do arrive with a very strong natural grass smell right out of the package. I highly recommend washing them in a water and vinegar solution, then letting them air or sun dry before your first use. Once the smell is gone, they are absolutely perfect!

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Reviewed in the United States on May 19, 2026