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ASTM 1H – 40H

Our hydrometers are produced in the United States by outstanding manufacturers known for quality craftsmanship and accuracy of reading. Manufactured strictly in accordance with all applicable ASTM specifications, these ASTM hydrometers have become the industry standard for close, accurate readings. All instruments in this series are available with our NIST Traceable certification, and as such serve as primary reference standards in many governmental and private laboratories.

ASTM API Gravity Plain Form Hydrometers

This grouping of hydrometers are preferred by most users in the petroleum industry as laboratory standards. A separate thermometer, ASTM 12F or 12C, should be used to precisely determine the temperature of the sample to permit correction of observed values to 60F (as specified in ASTM Method D1298).

Uncalibrated
ASTM Cat No API Range Div Length
1H 40001H -1 to 11 0.1 330mm
2H 40002H 9 to 21 0.1 330mm
3H 40003H 19 to 31 0.1 330mm
4H 40004H 29 to 41 0.1 330mm
5H 40005H 39 to 51 0.1 330mm
6H 40006H 49 to 61 0.1 330mm
7H 40007H 59 to 71 0.1 330mm
8H 40008H 69 to 81 0.1 330mm
9H 40009H 79 to 91 0.1 330mm
10H 40010H 89 to 101 0.1 330mm
Calibrated (as specified by ASTM)
ASTM Cat No API Range Div Length Certified at
1H 40001H-C -1 to 11 0.1 330mm 3 test points
2H 40002H-C 9 to 21 0.1 330mm 3 test points
3H 40003H-C 19 to 31 0.1 330mm 3 test points
4H 40004H-C 29 to 41 0.1 330mm 3 test points
5H 40005H-C 39 to 51 0.1 330mm 3 test points
6H 40006H-C 49 to 61 0.1 330mm 3 test points
7H 40007H-C 59 to 71 0.1 330mm 3 test points
8H 40008H-C 69 to 81 0.1 330mm 3 test points
9H 40009H-C 79 to 91 0.1 330mm 3 test points
10H 40010H-C 89 to 101 0.1 330mm 90, 95 API

ASTM API Gravity Hydrometers, Short Form

These hydrometers are popular in many applications due to their small size, thus allowing a reading to be obtained from a small amount of product sample (approximately 6 ounces of liquid).

Uncalibrated
ASTM Cat No API Range Div Length
21H 40021H 0 to 6 0.1 165mm
22H 40022H 5 to 11 0.1 165mm
23H 40023H 10 to 16 0.1 165mm
24H 40024H 15 to 21 0.1 165mm
25H 40025H 20 to 26 0.1 165mm
26H 40026H 25 to 31 0.1 165mm
27H 40027H 30 to 36 0.1 165mm
28H 40028H 35 to 41 0.1 165mm
29H 40029H 40 to 46 0.1 165mm
30H 40030H 45 to 51 0.1 165mm
31H 40031H 50 to 56 0.1 165mm
32H 40032H 55 to 61 0.1 165mm
33H 40033H 60 to 66 0.1 165mm
34H 40034H 65 to 71 0.1 165mm
35H 40035H 70 to 76 0.1 165mm
36H 40036H 75 to 81 0.1 165mm
37H 40037H 80 to 86 0.1 165mm
38H 40038H 85 to 91 0.1 165mm
39H 40039H 90 to 91 0.1 165mm
40H 40040H 95 to 101 0.1 165mm
Calibrated (as specified by ASTM)
ASTM Cat No API Range Div Length Certified at
21H 40021H-C 0 to 6 0.1 165mm 3 test points
22H 40022H-C 5 to 11 0.1 165mm 3 test points
23H 40023H-C 10 to 16 0.1 165mm 3 test points
24H 40024H-C 15 to 21 0.1 165mm 3 test points
25H 40025H-C 20 to 26 0.1 165mm 3 test points
26H 40026H-C 25 to 31 0.1 165mm 3 test points
27H 40027H-C 30 to 36 0.1 165mm 3 test points
28H 40028H-C 35 to 41 0.1 165mm 3 test points
29H 40029H-C 40 to 46 0.1 165mm 3 test points
30H 40030H-C 45 to 51 0.1 165mm 3 test points
31H 40031H-C 50 to 56 0.1 165mm 3 test points
32H 40032H-C 55 to 61 0.1 165mm 3 test points
33H 40033H-C 60 to 66 0.1 165mm 3 test points
34H 40034H-C 65 to 71 0.1 165mm 3 test points
35H 40035H-C 70 to 76 0.1 165mm 3 test points
36H 40036H-C 75 to 81 0.1 165mm 3 test points
37H 40037H-C 80 to 86 0.1 165mm 3 test points
38H 40038H-C 85 to 91 0.1 165mm 3 test points
39H 40039H-C 90 to 91 0.1 165mm 3 test points
40H 40040H-C 95 to 101 0.1 165mm 90 & 95 API

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