A. P. I. Hydrometers
(Plain Form)

The American Petroleum Institute; the United States Bureau of Mines, and the National Institute of Standards and Technology selected the API scale in 1921 as the standard for petroleum products in the United States. The following ASTM hydrometers are also used in many other applications and procedures set forth by ASTM, all are calibrated at 60°F

API, ASTM Hydrometers, Plain Form
(No Thermometer)

APl PLAIN FORM, 0.1° DIVISIONS, LENGTH 163 mm,
CAT.#	ASTM#	RANGE
2021H	21H	0 to 6°
2022H	22H	5 to 11°
2023H	23H	10 to 16°
2024H	24H	15 to 21°
2025H	25H	20 to 36°
2026H	26H	25 to 31°
2027H	27H	30 to 36°
2028H	28H	35 to 41°
2029H	29H	40 to 46°
2030H	30H	45 to 51°
2031H	31H	50 to 56°
2032H	32H	55 to 61°
2033H	33H	60 to 66°
2034H	34H	65 to 71°
2035H	35H	70 to 76°
2036H	36H	75 to 81°
2037H	37H	80 to 86°
2038H	38H	85 to 91°
2039H	39H	90 to 96°
2040H	40H	95 to 101°

SPECIFIC GRAVITY, PLAIN FORM, LENGTH 330 mm, DIVISIONS 0.0005°
CAT.#	ASTM#	RANGE
2082H	82H	0.650 to 0.700°
2083H	83H	0.700 to 0.750°
2084H	84H	0.750 to 0.800°
2085H	85H	0.800 to 0.850°
2086H	86H	0.850 to 0.900°
2087H	87H	0.900 to 0.950°
2088H	88H	0.950 to 1.000°
2089H	89H	1.000 to 1.050°
2090H	90H	1.050 to 1.100°

ASTM POUNDS/US GALLON WITH SURFACE TENSIONS OF 33 DYNES/CM OR LESS, PLAIN FORM, DIVISION 0.005, LENGTH 330 mm, TEMPERATURE STANDARD
CAT.#	ASTM#	RANGE
2293H	293H	5.83 to 6.24
2294H	294H	6.24 to 6.66
2295H	295H	6.66 to 7.08
2296H	296H	7.08 to 7.50
2297H	297H	7.50 to 7.91
2298H	298H	7.91 to 8.23

APl, PLAIN FORM, LENGTH 6"
CAT.#	RANGE	DIVISION
2500	10 to 45°	1.0°
2501	-1 to 11°	0.2°
2502	9 to 21°	0.2°
2503	19 to 31°	0.2°
2504	29 to 41°	0.2°
2505	39 to 51°	0.2°
2506	49 to 61°	0.2°
2507	59 to 71°	0.2°
2508	69 to 81°	0.2°
2509	79 to 91°	0.2°

SPECIFIC GRAVITY, PLAIN FORM, DIVISION 0.0005, LENGTH 330 mm
CAT.#	ASTM#	RANGE
2111H	111H	1.000 to 1.050
2112H	112H	1.050 to 1.100
2113H	113H	1.100 to 1.150
2114H	114H	1.150 to 1.200
2115H	115H	1.200 to 1.250
2116H	116H	1.250 to 1.300
2117H	117H	1.300 to 1.350
2118H	118H	1.350 to 1.400
2119H	119H	1.400 to 1.450
2120H	120H	1.450 to 1.500

SOIL ANALYSIS, PLAIN FORM, SPECIFIC GRAVITY, DIVISION 0.001, LENGTH 280 mm
CAT.#	ASTM#	RANGE	TEMP OF STANDARD
2151H	151H	0.995 to 1.038	68°/68°F

SOIL ANALYSIS, PLAIN FORM GRAMS OF SOIL COLLOIDS, DIVISION 1.0°, LENGTH 280 mm
CAT.#	ASTM#	RANGE	TEMP OF STANDARD
2152H	152H	-5 to 60 grams	68°

ASTM DENSITY, KG/M3, PLAIN FORM, TEMPERATURE STANDARD 15°C, DIVISIONS 0.5, LENGTH 330 mm
CAT.#	ASTM#	RANGE
2311H	311H	600 to 650
2312H	312H	650 to 700
2313H	313H	700 to 750
2314H	314H	750 to 800
2315H	315H	800 to 850
2316H	316H	850 to 900
2317H	317H	900 to 950
2318H	318H	950 to 1000
2319H	319H	1000 to 1050
2320H	320H	1050 to 1100

Barnstead/ERTCO Thermometers