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2. Helium mass spectrometer - Wikipedia

   en.wikipedia.org/wiki/Helium_mass_spectrometer

   A helium mass spectrometer is an instrument commonly used to detect and locate small leaks. It was initially developed in the Manhattan Project during World War II to find extremely small leaks in the gas diffusion process of uranium enrichment plants. [1] It typically uses a vacuum chamber in which a sealed container filled with helium is placed.

3. Infrared open-path detector - Wikipedia

   en.wikipedia.org/wiki/Infrared_open-path_detector

   Infrared open-path gas detectors send out a beam of infrared light, detecting gas anywhere along the path of the beam. This linear 'sensor' is typically a few metres up to a few hundred metres in length. Open-path detectors can be contrasted with infrared point sensors. They are widely used in the petroleum and petrochemical industries, mostly ...

4. Leak-down tester - Wikipedia

   en.wikipedia.org/wiki/Leak-down_tester

   A leak-down tester is a measuring instrument used to determine the condition of internal combustion engines by introducing compressed air into the cylinder and measuring the rate at which it leaks out. Compression testing is a crude form of leak-down testing which also includes effects due to compression ratio, valve timing, cranking speed, and ...

5. Your free COVID-19 at-home tests from the government ... - AOL

   www.aol.com/free-covid-19-home-tests-120202104.html

   The free COVID-19 tests the federal government recently rolled out will expire soon, but there is an explanation for that.. Two weeks ago, the U.S. Department of Health and Human Services (HHS ...

6. Savings interest rates today: Peak rates are behind us, but ...

   www.aol.com/finance/savings-interest-rates-today...

   After three years, you’d have earned $900 in interest — $300 each year — for a total of $10,900 in your account. Now let's say you invest $10,000 in an account that pays 3% compounded annually.

7. Pennsylvania court reverses ruling allowing misdated mail-in ...

   www.aol.com/pennsylvania-court-reverses-ruling...

   The Pennsylvania Supreme Court ruled Friday that mail-in ballots with incorrect dates will not be counted in November, reversing a previous ruling from a lower court in the battleground state. The ...