ARE BRAKE FLUID TESTERS ACCURATE ???

A Viewer had left this comment so I had to test for myself and see if there was any truth to it.
Brake Fluid tester https://amzn.to/3KrFu74

Brake pressure was transmitted by brake fluid, the pressure transmit will out of function once brake fluid include too water. In order to safe-driving, we must test water ratio scale in brake fluid regularly. The brake fluid tester help us do current maintenance, make sure we drive in safety condition.
Chromed detector resistant to oils and oxidation; 2.2 inch LCD display with backlit provide intuitive interface.
Buzzing and red light double alarm system, test result is clear absolutely.It can be resistant to oils and oxidation
Brake fluid tester with 250mm goose neck probe provides flexibility of detection.
Immerse the probe into brake fluid, the different colored LED lights mean as below:
Green Light: indicates the brake fluid water content is below 1%
The First Yellow Light: indicates the brake fluid water content is approximately 1.5%
The Second Yellow Light: indicates the brake fluid water content is approximately 2.5%
The First Red Light: indicates the brake fluid water content is approximately 3%
The Second Red Light: indicates the brake fluid water content is more than 4%

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