ASTM 41HL – 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 |