Standard Lab Hydrometers

Density and Specific Gravity Hydrometers to BS 718 and Other National and International Standards

These hydrometers are ideal for use in laboratories, and are made in accordance with national and international standards. They can be supplied with calibration certificates, or certificates showing traceability to national UKAS standards.

Clear, easy to read double scales Density Hydrometers in g/ml at 20°C are to BS 718 specification, or equivalents ISO 649, DIN 12791, NF B 35-511, JIS B 7525. Specific Gravity Hydrometers in S60/60°F are to ISO 650 (the same as the obsolete BS 718: 1961) or ASTM E100 specifications. Calibrated for reading at the horizontal surface of the liquid. Each hydrometer is uniquely numbered. Fiducial mark (datum line) allows calibration by UKAS labs.

These hydrometers are available calibrated for liquids of low, medium and high surface tensions. Low ST calibration is available for hydrometers measuring from 0.600 to 1.300, medium ST calibration is available for hydrometers measuring above 0.960, and high ST calibration is available for hydrometers measuring above 1.000.

Hydrometers are usually supplied as Low ST below 1.000, Medium ST from 1.000 to 1.600, and High ST above 1.600. To specify a product use the prefix shown, followed by the start of the range. For example a 1.050/1.100 L50 density hydrometer for medium ST would be DC3339/105.

L50 Series (335 mm long, 0.050 range)
Density Hydrometers, scale divisions 0.0005 g/ml.
Low ST: DB3339/      Medium ST: DC3339/      High ST: DD3339/
Specific Gravity Hydrometers, scale divisions 0.0005 S60/60°F.
Low ST: DX3339/      Medium ST: DY3339/      High ST: DZ3339/

M50 Series (270 mm long, 0.050 range)
Density Hydrometers, scale divisions 0.001 g/ml.
Low ST: DB2746/      Medium ST: DC2746/      High ST: DD2746/
Specific Gravity Hydrometers, scale divisions 0.001 S60/60°F.
Low ST: DX2746/      Medium ST: DY2746/      High ST: DZ2746/

M100 Series (250 mm long, 0.100 range)
Density Hydrometers, scale divisions 0.002 g/ml.
Low ST: DB2563/      Medium ST: DC2563/      High ST: DD2563/
Specific Gravity Hydrometers, scale divisions 0.002 S60/60°F.
Low ST: DX2563/      Medium ST: DY2563/      High ST: DZ2563/

S50 Series (190 mm long, 0.050 range)
Density Hydrometers, scale divisions 0.002 g/ml.
Low ST: DB1958/      Medium ST: DC1958/      High ST: DD1958/
Specific Gravity Hydrometers, scale divisions 0.002 S60/60°F.
Low ST: DX1958/      Medium ST: DY1958/      High ST: DZ1958/

ASTM E100 Specific Gravity, Plain Form
These are hydrometers covering ranges of 0.050 S60/60°F.
Long hydrometers are 335 mm long, with 0.0005 scale divisions.
Short hydrometers are 270 mm long, with 0.001 scale divisions.
To specify a product use the prefix shown, followed by the ASTM hydrometer number.
Long Plain Form: DU3339/      Short Plain Form: DU2746/