HB Instrument Company Plain Form Specific Gravity Hydrometers. The HB Instrument Co. Hydrometer measures the density of a solution to a known standard and accounts for the mass of liquid added to a solution as it changes from one specific gravity to another. The HB Instrument Company Hydrometer plain form has a stem diameter that is graduated to indicate SG. Each instrument is supplied with a certificate of calibration which shows the traceability to standards provided by the National Institute of Standards and Technology. Specifications for HB Instrument Company Plain Form Specific Gravity Hydrometers 50515 : Range Specific Gravity: 1.200 to 1.450 Unit: Each (Please note that the description and stock photo may not correspond to the specific model listed above) We offer only genuine HB Instrument Company products authorized for sale in the U.S. and other markets so you can be sure that you are buying authentic Labware & Accessories with a full manufacturer's warranty in addition to our own 100percent Satisfaction Guarantee. We are your premier online distributor for HB Instrument Company Labware & Accessories. We are an authorized supplier to all federal and state government agencies as well as to research and educational institutions and can facilitate volume orders on many types of laboratory equipment lab consumables and other products to help fulfill your specific needs. We offer Free Shipping and FREE USPS shipping to APO and FPO addresses on all orders in our store over 49. Please refer to our APO/FPO Shipping and Export Restrictions for more information on export to APO/FPO addresses. In addition to the HB Instrument Company Plain Form Specific Gravity Hydrometers 50515/ 34623-150 we carry a full complement of Labware & Accessories as well as other product offerings from HB Instrument Company. We also carry a full line of HB Instrument Company accessories to help meet your laboratory and scientific needs. For a complete selection of HB Instrument Company Labware & Accessories please visit our HB Instrument Company page. For more brand name Labware & Accessories please visit our Labware & Accessories store section. To see our complete line of lab medical industrial and scientific products please see our science and lab equipment online catalog. HB Instrument Company Plain Form Specific Gravity Hydrometers 50515