ASTM Hydrometers 41HL through 74H

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 Thermo-Hydrometers

These hydrometers are fabricated with a thermometer in the lower body for convenience to the user. For any particular API gravity range, three temperature ranges are available, coded as follows: L=Low 0/150F, M=Medium 30/180F, H=High 60/220F. The units listed below are the most popular. Variations are available on special request.

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	API Div	Temp Range	F Div	Length
41HL	40041HL	15 to 23	0.1	0 to 150F	2	380mm
42HL	40042HL	22 to 30	0.1	0 to 150F	2	380mm
43HL	40043HL	29 to 37	0.1	0 to 150F	2	380mm
44HL	40044HL	36 to 44	0.1	0 to 150F	2	380mm
45HL	40045HL	43 to 51	0.1	0 to 150F	2	380mm
51HH	40051HH	-1 to 11	0.1	60 to 220F	2	380mm
52HH	40052HH	9 to 21	0.1	60 to 220F	2	380mm
53HL	40053HL	19 to 31	0.1	0 to 150F	2	380mm
53HM	40053HM	19 to 31	0.1	30 to 180F	2	380mm
54HL	40054HL	29 to 41	0.1	0 to 150F	2	380mm
54HM	40054HM	29 to 41	0.1	30 to 180F	2	380mm
55HL	40055HL	39 to 51	0.1	0 to 150F	2	380mm
56HL	40056HL	49 to 61	0.1	0 to 150F	2	380mm
57HL	40057HL	59 to 71	0.1	0 to 150F	2	380mm
58HL	40058HL	69 to 81	0.1	0 to 150F	2	380mm
59HL	40059HL	79 to 91	0.1	0 to 150F	2	380mm
60HL	40060HL	89 to 101	0.1	0 to 150F	2	380mm
Calibrated (as specified by ASTM)
ASTM	Cat No	API Range	API Div	Temp Range	F Div	Length	Certified at
41HL	40041HL-C	15 to 23	0.1	0 to 150F	2	380mm	3 test points
42HL	40042HL-C	22 to 30	0.1	0 to 150F	2	380mm	3 test points
43HL	40043HL-C	29 to 37	0.1	0 to 150F	2	380mm	3 test points
44HL	4044HL-C	36 to 44	0.1	0 to 150F	2	380mm	3 test points
45HL	40045HL-C	43 to 51	0.1	0 to 150F	2	380mm	3 test points
51HH	40051HH-C	-1 to 11	0.1	60 to 220F	2	380mm	3 test points
52HH	40052HH-C	9 to 21	0.1	60 to 220F	2	380mm	3 test points
53HL	40053HL-C	19 to 31	0.1	0 to 150F	2	380mm	3 test points
53HM	40053HM-C	19 to 31	0.1	30 to 180F	2	380mm	3 test points
54HL	40054HL-C	29 to 41	0.1	0 to 150F	2	380mm	3 test points
54HM	40054HM-C	29 to 41	0.1	30 to 180F	2	380mm	3 test points
55HL	40055HL-C	39 to 51	0.1	0 to 150F	2	380mm	3 test points
56HL	40056HL-C	49 to 61	0.1	0 to 150F	2	380mm	3 test points
57HL	40057HL-C	59 to 71	0.1	0 to 150F	2	380mm	3 test points
58HL	40058HL-C	69 to 81	0.1	0 to 150F	2	380mm	3 test points
59HL	40059HL-C	79 to 91	0.1	0 to 150F	2	380mm	3 test points
60HL	40060HL-C	89 to 101	0.1	0 to 150F	2	380mm	3 test points

ASTM API Thermo-Hydrometers With Thermometer In Stem

The 30/220F thermometer with the scale in the stem is useful for testing of heavy oils where dark color prevents reading the thermometer in the body of a conventional thermo-hydrometer.

Uncalibrated
ASTM	Cat No	API Range	API Div	Temp Range	F Div	Length
71H	40071H	-1 to 11	0.1	30 to 220F	2	380mm
72H	40072H	9 to 21	0.1	30 to 220F	2	380mm
73H	40073H	19 to 31	0.1	30 to 220F	2	380mm
74H	40074H	29 to 41	0.1	30 to 220F	2	380mm
Calibrated (as specified by ASTM)
ASTM	Cat No	API Range	API Div	Temp Range	F Div	Length	Certified at
71H	40071H-C	-1 to 11	0.1	30 to 220F	2	380mm	3 test points
72H	40072H-C	9 to 21	0.1	30 to 220F	2	380mm	3 test points
73H	40073H-C	19 to 31	0.1	30 to 220F	2	380mm	3 test points
74H	40074H-C	29 to 41	0.1	30 to 220F	2	380mm	3 test points