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API Short Form Hydrometers and Thermo-hydrometers

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6-1/2″ API Hydrometers

This grouping of hydrometers are not ASTM – but are enormously popular in the same applications as the ASTM 21 through 39H hydrometers. All are 165mm in length, graduated in 0.2 API divisions, and made to the same demanding tolerances as ASTM hydrometers.

Hydrometers With Calibration

Catalog No API Range Div Calibration Test Points
500-004-C -1 to 11 0.2 Calibrated @ 0, 5, 10 API
500-006-C 9 to 21 0.2 Calibrated @ 10, 15, 20 API
500-008-C 19 to 31 0.2 Calibrated @ 20, 25, 30 API
500-010-C 29 to 41 0.2 Calibrated @ 30, 35, 40 API
500-012-C 39 to 51 0.2 Calibrated @ 40, 45, 50 API
500-014-C 49 to 61 0.2 Calibrated @ 50, 55, 60 API
500-016-C 59 to 71 0.2 Calibrated @ 60, 65, 70 API
500-018-C 69 to 81 0.2 Calibrated @ 70, 75, 80 API
500-020-C 79 to 91 0.2 Calibrated @ 80, 85, 90 API
500-022-C 89 to l0l 0.2 Calibrated @ 90, 93 API

Hydrometers Without Calibration

Catalog No API Range Div
500-004 -1 to 11 0.2
500-006 9 to 21 0.2
500-008 19 to 31 0.2
500-010 29 to 41 0.2
500-012 39 to 51 0.2
500-014 49 to 61 0.2
500-016 59 to 71 0.2
500-018 69 to 81 0.2
500-020 79 to 91 0.2
500-022 89 to l0l 0.2

Short Form 7-1/2″ Thermo Hydrometers

Approximately 190mm (7-1/2″) Length. Thermometer in body. Not ASTM designated, but made to similar specifications. Popular due to the smaller sample amount (approx 6 ounces) ounces needed to obtain a reading. Made to the same demanding tolerances as ASTM hydrometers. Accuracy: +/- 1 scale division.

Hydrometers With Calibration

Catalog No API Range Div Temp Range Div Length Calibration Test Points
500-100-C -1 to 11 0.2 0 to 130 °F 2 190mm Calibrated @ 0, 5, 10 API
500-102-C 9 to 21 0.2 0 to 130 °F 2 190mm Calibrated @ 10, 15, 20 API
500-104-C 19 to 31 0.2 0 to 130 °F 2 190mm Calibrated @ 20, 25, 30 API
500-106-C 29 to 41 0.2 0 to 130 °F 2 190mm Calibrated @ 30, 35, 40 API
500-108-C 39 to 51 0.2 0 to 130 °F 2 190mm Calibrated @ 40, 45, 50 API
500-110-C 49 to 61 0.2 0 to 130 °F 2 190mm Calibrated @ 50, 55, 60 API
500-112-C 59 to 71 0.2 0 to 130 °F 2 190mm Calibrated @ 60, 65, 70 API
500-114-C 69 to 81 0.2 0 to 130 °F 2 190mm Calibrated @ 70, 75, 80 API
500-116-C 79 to 91 0.2 0 to 130 °F 2 190mm Calibrated @ 80, 85, 90 API
500-118-C 89 to 101 0.2 0 to 130 °F 2 190mm Calibrated @ 90, 93 API

Hydrometers Without Calibration

Catalog No API Range Div Temp Range Div Length
500-100 -1 to 11 0.2 0 to 130 °F 2 190mm
500-102 9 to 21 0.2 0 to 130 °F 2 190mm
500-104 19 to 31 0.2 0 to 130 °F 2 190mm
500-106 29 to 41 0.2 0 to 130 °F 2 190mm
500-108 39 to 51 0.2 0 to 130 °F 2 190mm
500-110 49 to 61 0.2 0 to 130 °F 2 190mm
500-112 59 to 71 0.2 0 to 130 °F 2 190mm
500-114 69 to 81 0.2 0 to 130 °F 2 190mm
500-116 79 to 91 0.2 0 to 130 °F 2 190mm
500-118 89 to 101 0.2 0 to 130 °F 2 190mm
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