API Hydrometers

The API scale was selected in 1921 by the American Petroleum Institute (API), the U.S. Bureau of Mines, and the National Institute of Standards and Technology (NIST) as the standard hydrometer scale for petroleum products. On select API Hydrometer Hydrometers with a built-in thermometer, the thermometer scale is located in the body of the hydrometer. A correction scale for conversion of the reading to 60°F is printed opposite the temperature scale. Our API ASTM Specification Hydrometers are manufactured in strict accordance to specifications of ASTM (American Society for Testing and Materials) for accuracy and design.

55 Products

B61898-0000
19 to 31° API Durac Hydrometer, ASTM No. 3H with a NIST Traceable Calibration Certificate (each) [H-B Instrument # 3H-FC]
$390.19 $459.05

New

B61898-0100
29 to 41° API Durac Hydrometer, ASTM No. 4H with a NIST Traceable Calibration Certificate (each) [H-B Instrument # 4H-FC]
$390.19 $459.05

New

B61898-0200
49 to 61° API Durac Hydrometer, ASTM No. 6H with a NIST Traceable Calibration Certificate (each) [H-B Instrument # 6H-FC]
$390.19 $459.05

New

B61898-0300
59 to 71° API Durac Hydrometer, ASTM No. 7H with a NIST Traceable Calibration Certificate (each) [H-B Instrument # 7H-FC]
$390.19 $459.05

New

B61898-0400
69 to 81° API Durac Hydrometer, ASTM No. 8H with a NIST Traceable Calibration Certificate (each) [H-B Instrument # 8H-FC]
$390.19 $459.05

New

B61898-0500
79 to 91° API Durac Hydrometer, ASTM No. 9H with a NIST Traceable Calibration Certificate (each) [H-B Instrument # 9H-FC]
$390.19 $459.05

New

B61898-2000
-1 to 11° API Durac Hydrometer, ASTM No. 1H with a NIST Traceable Calibration Certificate (each) [H-B Instrument # 1H-FC]
$294.61 $346.60

New

B61898-2100
9 to 21° API Durac Hydrometer, ASTM No. 2H with a NIST Traceable Calibration Certificate (each) [H-B Instrument # 2H-FC]
$386.28 $454.45

New

B61898-2200
39 to 51° API Durac Hydrometer, ASTM No. 5H with a NIST Traceable Calibration Certificate (each) [H-B Instrument # 5H-FC]
$390.19 $459.05

New

B61803-0000
-1 to 11° API Durac Plain Form Hydrometer (each) [H-B Instrument # 50005]
$32.98 $38.80

New

B61803-0100
9 to 21° API Durac Plain Form Hydrometer (each) [H-B Instrument # 50010]
$39.57 $46.55

New

B61803-0200
19 to 31° API Durac Plain Form Hydrometer (each) [H-B Instrument # 50020]
$33.07 $38.90

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B61803-0300
29 to 41° API Durac Plain Form Hydrometer (each) [H-B Instrument # 50025]
$32.98 $38.80

New

B61803-0400
39 to 51° API Durac Plain Form Hydrometer (each) [H-B Instrument # 50030]
$32.98 $38.80

New

B61803-0500
49 to 61° API Durac Plain Form Hydrometer (each) [H-B Instrument # 50035]
$33.07 $38.90

New

B61803-0600
59 to 71° API Durac Plain Form Hydrometer (each) [H-B Instrument # 50040]
$32.98 $38.80

New

B61803-0700
69 to 81° API Durac Plain Form Hydrometer (each) [H-B Instrument # 50045]
$32.73 $38.50

New

B61803-0800
79 to 91° API Durac Plain Form Hydrometer (each) [H-B Instrument # 50050]
$32.73 $38.50

New

B61803-0900
10 to 45° API Durac Plain Form Hydrometer (each) [H-B Instrument # 50000]
$39.53 $46.50

New

B61823-0000
-1 to 11° API Durac SAFETYBLUE Precision Thermo-Hydrometer (each) [H-B Instrument # 4830]
$61.97 $72.90

New

B61823-0100
9 to 21° API Durac SAFETYBLUE Precision Thermo-Hydrometer (each) [H-B Instrument # 4835]
$73.82 $86.85

New

B61823-0200
19 to 31° API Durac SAFETYBLUE Precision Thermo-Hydrometer (each) [H-B Instrument # 4840]
$74.42 $87.55

New

B61823-0300
29 to 41° API Durac SAFETYBLUE Precision Thermo-Hydrometer (each) [H-B Instrument # 4845]
$74.42 $87.55

New

B61823-0400
39 to 51° API Durac SAFETYBLUE Precision Thermo-Hydrometer (each) [H-B Instrument # 4850]
$72.17 $84.90

New

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Select up to 4 items to compare.