227 HYDROMETERS
Plain Form Hydrometers
Types of Kimble® Hydrometers
About Specific Gravity
Specific Gravity – The most widely used form of hydrometer, this style is available in tall form, short form, and broad range. • A serial number is printed on the scale, a certificate of traceability is included, and the hydrometer is calibrated to ASTM specifications to ensure accuracy. • The certificate of traceability indicates that the hydrometers are manufactured using devices calibrated using NIST traceable standards. • The ballast is made from steel pellets and a binder, and it is free of heavier metals.
Specific gravity is a dimensionless number and is a measure of relative density. RD = substance / reference RD is relative density, substance is the substance being measured, and reference is the reference substance. Typically the reference substance is water, and the calibration temperature for Kimble hydrometers is 60 °F, as specified in the ASTM standards.
Conditions Affecting Hydrometer Accuracy
Important considerations when assessing the accuracy of the hydrometer readings are: • Cleanliness of the instruments • Temperature of the sample • Uniformity of the sample • Proper immersion of the hydrometer in the sample Before a Kimble® hydrometer is used it should be closely inspected for cracks or damage. It should be thoroughly cleaned with a laboratory detergent according to the manufacturer’s recommendations, rinsed with water, and dried with a lint-free wipe. The hydrometer cylinder should also be washed and rinsed prior to use. The temperature of the sample should be near that of the surrounding atmosphere to prevent changes during reading of the scale. To standardize the relative density to 60 / 60 °F, a temperature correction factor may be applied using a temperature correction factor table such as the one found in ASTM D1250 for glass hydrometers. Baume – The Baume scale originally was used in industrial chemistry and pharmacology, but today it is used in brewing, winemaking, sugar beet processing, ophthalmics, and the starch industry. Although specific gravity is a dimensionless number, the Baume scale is graduated in degrees Baume. According to Perry’s Chemical Engineers’ Handbook (8th Edition), °Be’ = 145 – 145/sp gr (heavier than water), and °Be’ = 140/sp gr - 130 (lighter than water). • A serial number is printed on the scale, a certificate of traceability is included, and the hydrometer is calibrated to ASTM specifications to ensure accuracy. • The certificate of traceability indicates that the hydrometers are manufactured using devices calibrated using NIST traceable standards. • The ballast is made from steel pellets and a binder, and it is free of heavier metals.
Precision Specific Gravity Hydrometers
Length (mm)
Case Qty
Part Number
Scale Range; Subdivisions
52110-0708 52110-0809 52110-0910 52110-1012 52110-1214 52110-1416 52110-1618 52110-1820 52110-2000
SG 0.700-0.810; 0.001 SG SG 0.800-0.910; 0.001 SG SG 0.900-1.010; 0.001 SG SG 1.000-1.220; 0.001 SG SG 1.200-1.420; 0.001 SG SG 1.400-1.620; 0.001 SG SG 1.600-1.820; 0.001 SG SG 1.800-2.000; 0.001 SG
310 300 310 300 300 300 300 300
1 1 1 1 1 1 1 1 1
Set of eight
Tall Form High Precision Specific Gravity Hydrometers
Length (mm)
Case Qty
Part Number
Scale Range; Subdivisions
52111-0708 52111-0809 52111-0810 52111-0910 52111-1011 52111-1111 52111-1112 52111-1212 52111-1213 52111-1314 52111-1414 52111-1415
SG 0.760-0.830; 0.0005 SG SG 0.820-0.890; 0.0005 SG SG 0.880-0.950; 0.0005 SG SG 0.940-1.010; 0.0005 SG SG 1.000-1.070; 0.0005 SG SG 1.060-1.130; 0.0005 SG SG 1.120-1.190; 0.0005 SG SG 1.180-1.250; 0.0005 SG SG 1.240-1.310; 0.0005 SG SG 1.300-1.370; 0.0005 SG SG 1.360-1.430; 0.0005 SG SG 1.420-1.490; 0.0005 SG
330 330 330 330 330 330 330 330 330 330 330 330
1 1 1 1 1 1 1 1 1 1 1 1
Short Form High Precision Specific Gravity Hydrometers
Length (mm)
Case Qty
Part Number
Scale Range; Subdivisions
52112-0809 52112-0909 52112-0910 52112-1011 52112-1111 52112-1112 52112-1113 52112-1213
SG 0.820-0.890; 0.0001 SG SG 0.880-0.950; 0.0001 SG SG 0.940-1.010; 0.0001 SG SG 1.000-1.070; 0.0001 SG SG 1.060-1.130; 0.0001 SG SG 1.120-1.190; 0.0001 SG SG 1.180-1.250; 0.0001 SG
165 165 165 165 165 165 165 165
1 1 1 1 1 1 1 1
Narrow Range Baume Hydrometers
Length (mm)
Part Number
Scale Range; Subdivisions
Case Qty
52120-0012 52120-0921 52120-1931 52120-3951
0° - 12° Baume; 0.10° Baume 9° - 21° Baume; 0.10° Baume 9° - 21° Baume; 0.10° Baume 39° - 51° Baume; 0.10° Baume
300 300 300 300
1 1 1 1
SG 1.240-1.310
Broad Range Specific Gravity Hydrometer for Liquids Lighter than Water
Broad Range Baume Hydrometers
Length (mm)
Case Qty
Part Number
Scale Range; Subdivisions
Length (mm)
Case Qty
Part Number
Scale Range; Subdivisions
52113-0610
SG 0.650-1.000; 0.0001 SG
300
1
52121-0035 52121-0050 52121-0070
0° - 35° Baume; 0.5° Baume 0° - 50° Baume; 0.5° Baume 0° - 70° Baume; 1.0° Baume
300 300 305
1 1 1
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