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2. Hydrometer - Wikipedia

   en.wikipedia.org/wiki/Hydrometer

   The state of charge of a lead-acid battery can be estimated from the density of the sulfuric acid solution used as electrolyte. A hydrometer calibrated to read specific gravity relative to water at 60 °F (16 °C) is a standard tool for servicing automobile batteries. Tables are used to correct the reading to the standard temperature.

3. Lead–acid battery - Wikipedia

   en.wikipedia.org/wiki/Lead–acid_battery

   A hydrometer can be used to test the specific gravity of each cell as a measure of its state of charge. Because the electrolyte takes part in the charge-discharge reaction, this battery has one major advantage over other chemistries: it is relatively simple to determine the state of charge by merely measuring the specific gravity of the ...

4. Battery tester - Wikipedia

   en.wikipedia.org/wiki/Battery_tester

   Battery tester. A battery tester is an electronic device intended for testing the state of an electric battery, going from a simple device for testing the charge actually present in the cells and/or its voltage output, to a more comprehensive testing of the battery's condition, namely its capacity for accumulating charge and any possible flaws affecting the battery's performance and security.

5. Category:Measuring instruments - Wikipedia

   en.wikipedia.org/wiki/Category:Measuring_instruments

   Fahrenheit hydrometer; Faraday cup; Farinograph; Filar micrometer; Flight instruments; Force gauge; Formazine; Foucault knife-edge test; Fourier-transform ion cyclotron resonance; Freezing point depression osmometer; Frequency domain sensor; Full body scanner; Furrow profilometer

6. VRLA battery - Wikipedia

   en.wikipedia.org/wiki/VRLA_battery

   A 12V VRLA battery, typically used in small uninterruptible power supplies and emergency lamps. A valve regulated lead–acid (VRLA) battery, commonly known as a sealed lead–acid (SLA) battery, [1] is a type of lead–acid battery characterized by a limited amount of electrolyte ("starved" electrolyte) absorbed in a plate separator or formed into a gel; proportioning of the negative and ...

7. 9 Items You Should Actually Store In The Freezer, According ...

   www.aol.com/9-items-actually-store-freezer...

   Certain items like high-moisture content vegetables (we’re looking at you, lettuce), mayonnaise, cream sauces, and anything gelatin-based are definitely best to store in the fridge instead.