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API /ASTM Hydrometers
 API/ASTM ThermoHydrometers and Plain Hydrometers are devices for measuring the density of liquids and gases. Although API Hydrometers actually measure density, it is commonly expressed in the terms of specific gravity, which is the ratio of the density of the substance being measured to the density of water at the same temperature.
 In exacting, scientific observations, the reference may be to pure (double-distilled) water at 40?C (39.2?F) In engineering practice, the reference frequently is to pure water at 15.6?C (60?F). A value of unity is established for water, 1.000. Thus liquids with a specific gravity less than 1.000 are lighter than water; those with a specific gravity greater than 1.000 are heavier than water.
 The specific gravity for a given gas is the ratio of the density of the gas to the density of air. Since the density of air varies markedly with both temperature and pressure, exacting observations should reflect both conditions. Common reference conditions are 0?C (32?F) and 1 atmosphere.
API/ASTM Hydrometer scales are numerous. There are many scales in common use today in different industries and applications; such as Specific Gravity Hydrometers, API/ASTM Hydrometers, Baumé Hydrometers, Brix Hydrometers, Twaddle Hydrometers, Plain Form Hydrometers, etc..
All of the API/ASTM Hydrometers are made in accordance with API specifications and calibrated to API scale Modulus 141.5 at 60 degrees F. All API/ASTM thermohydrometers are of precision grade. The Hydrometers are constructed with a solid alloy ballast and designed to permit quick penetration to the settling point, creating no air bubbles. Scale is sealed in place by a red glass strap fused to the stem and the top of the gravity scale even with the last number line.
Certified API Hydrometer
Certified Hydrometers are available upon request. API/ASTM hydrometers are certified at three points on the hydrometer scale as specified by NIST (formerly NBS). On the combined form, the thermometer is provided with a 60 degree F test point correction. Each API/ASTM ThermoHydrometer is accompanied by a document of certification that includes the correction of each point tested.
API/ASTM Hydrometers
All API/ASTM hydrometers are made in accordance with API specifications and calibrated to API scale Modulus 141.5 at 60 degrees F. All API/ASTM hydrometers are of precision grade. The API hydrometers are constructed with a solid alloy ballast and designed to permit quick penetration to the settling point, creating no air bubbles. The API hydrometer scale is sealed in place by a red glass strap fused to the stem of the hydrometer and the top of the gravity scale even with the last number line.
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Hydrometer Cases
Hydrometer Cases for carrying three 15 inch hydrometers. It is made of plastic with separate compartments, for each compartment lined with felt. The lid has a 37-degree angle cut, which allows it to arc away from the hydrometers when open, thus preventing stem breakage. There are two models to choose from. One model has a spring loaded hinge that holds the lid open or closed under spring tension and the other model is equipped with a standard hinge and a positive tension-type latch which holds the lid securely closed until released.
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Hydrometer Cylinders
Hydrometer Cylinders are ideal for use in testing the gravity of crude oil. The hydrometer cylinders are transparent and light weight. The graduated hydrometer cylinder is calibrated to contain/deliver at 20 degrees C. Single molded-in metric scale, transparent with pour-out spout. This hydromer cylinder is compatible with virtually any chemical for typical brief use. Hydrometer cylinder is shatterproof with large base.
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Hydrometer Heaters
Hydrometer Heaters for low gravity oil where the hydrometer gravity test cannot be made without a hydrometer heater for heating the oil sample.Two hydrometer heater models are water heated and two heater models are electrically heated. The water-heated models come in floor mounted or side mounted . The electrically heated models are floor mounted. The side-mounted hydrometer heater model is drained from the bottom and requires no separate hydrometer cylinder for the hydrometer heater.
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