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Density Hydrometers - BS 718 : 1991
The standard BS 718 : 1991 is generally aligned with ISO 387 and ISO 649. The specification includes five series and three sub-series of Hydrometers, of which the most widely used are listed. They are calibrated using the accepted units of density: grams per milliliter (g/ml).

BS718:1991 Density Hydrometers Series S50



Range Span 0.050g/ml
 Length = 190mm
Divisioned in 0.002 g/ml
adjusted at 20°C
Hydrometer Range
g/ml
Surface
Tension
 Product No
0.60 to 0.65 Low 10/300/0
0.65 to 0.70 10/301/0
0.70 to 0.75 10/302/0
0.75 to 0.80 10/303/0
0.80 to 0.85 10/304/0
0.85 to 0.90 10/305/0
0.90 to 0.95 10/306/0
0.95 to 1.00 10/307/0
1.00 to 1.05 Medium 10/308/0
1.05 to 1.10 10/309/0
1.10 to 1.15 10/310/0
1.15 to 1.20 10/311/0
1.20 to 1.25 10/312/0
1.25 to 1.30 10/313/0
1.30 to 1.35 10/314/0
1.35 to 1.40 10/315/0
1.40 to 1.45 10/316/0
1.45 to 1.50 10/317/0
1.50 to 1.55 10/318/0
1.55 to 1.60 10/319/0
1.60 to 1.65 10/320/0
1.65 to 1.70 10/321/0
1.70 to 1.75 10/322/0
1.75 to 1.80 10/323/0
1.80 to 1.85 10/324/0
1.85 to 1.90 10/325/0
1.90 to 1.95 10/326/0
1.95 to 2.00 10/327/0
For trade price & delivery: Please contact us for details.

BS718:1991 Density Hydrometers Series M50



Range Span 0.050g/ml
Length = 270mm
Divisioned in 0.001 g/ml
adjusted at 20°C
Hydrometer Range
g/ml
Surface
Tension
 Product No
0.60 to 0.65 Low 10/330/0
0.65 to 0.70 10/331/0
0.70 to 0.75 10/332/0
0.75 to 0.80 10/333/0
0.80 to 0.85 10/334/0
0.85 to 0.90 10/335/0
0.90 to 0.95 10/336/0
0.95 to 1.00 10/337/0
1.00 to 1.05 Medium 10/338/0
1.05 to 1.10 10/339/0
1.10 to 1.15 10/340/0
1.15 to 1.20 10/341/0
1.20 to 1.25 10/342/0
1.25 to 1.30 10/343/0
1.30 to 1.35 10/344/0
1.35 to 1.40 10/345/0
1.40 to 1.45 10/346/0
1.45 to 1.50 10/347/0
1.50 to 1.55 10/348/0
1.55 to 1.60 10/349/0
1.60 to 1.65 10/350/0
1.65 to 1.70 10/351/0
1.70 to 1.75 10/352/0
1.75 to 1.80 10/353/0
1.80 to 1.85 10/354/0
1.85 to 1.90 10/355/0
1.90 to 1.95 10/356/0
1.95 to 2.00 10/357/0
For trade price & delivery: Please contact us for details.

BS718:1991 Density Hydrometers Series L50



Range Span 0.050g/ml
Length = 330mm
Divisioned in 0.0005 g/ml
adjusted at 20°C
Hydrometer Range
g/ml
Surface
Tension
 Product No
0.60 to 0.65 g/ml Low 10/360/0
0.65 to 0.70 g/ml 10/361/0
0.70 to 0.75 g/ml 10/362/0
0.75 to 0.80 g/ml 10/363/0
0.80 to 0.85 g/ml 10/364/0
0.85 to 0.90 g/ml 10/365/0
0.90 to 0.95 g/ml 10/366/0
0.95 to 1.00 g/ml 10/367/0
1.00 to 1.05 g/ml Medium 10/368/0
1.05 to 1.10 g/ml 10/369/0
1.10 to 1.15 g/ml 10/370/0
1.15 to 1.20 g/ml 10/371/0
1.20 to 1.25 g/ml 10/372/0
1.25 to 1.30 g/ml 10/373/0
1.30 to 1.35 g/ml 10/374/0
1.35 to 1.40 g/ml 10/375/0
1.40 to 1.45 g/ml 10/376/0
1.45 to 1.50 g/ml 10/377/0
1.50 to 1.55 g/ml 10/378/0
1.55 to 1.60 g/ml 10/379/0
1.60 to 1.65 g/ml 10/380/0
1.65 to 1.70 g/ml 10/381/0
1.70 to 1.75 g/ml 10/382/0
1.75 to 1.80 g/ml 10/383/0
1.80 to 1.85 g/ml 10/384/0
1.85 to 1.90 g/ml 10/385/0
1.90 to 1.95 g/ml 10/386/0
1.95 to 2.00 g/ml 10/387/0
For trade price & delivery: Please contact us for details.

BS718:1991 Density Hydrometers Series M100



Range Span 0.100g/ml
Length = 250mm
Divisioned in 0.002 g/ml
adjusted at 20°C

Hydrometer Range
g/ml
Surface
Tension
 Product No
0.60 to 0.70 Low 10/400/0
0.70 to 0.80 10/401/0
0.80 to 0.90 10/402/0
0.90 to 1.00 10/403/0
1.00 to 1.10 Medium 10/404/0
1.10 to 1.20 10/405/0
1.20 to 1.30 10/406/0
1.30 to 1.40 10/407/0
1.40 to 1.50 10/408/0
1.50 to 1.60 10/409/0
1.60 to 1.70 10/410/0
1.75 to 1.80 10/411/0
1.80 to 1.90 10/412/0
1.90 to 2.00 10/413/0
For trade price & delivery: Please contact us for details.

BS718:1991 Density Hydrometers Sub-series M50 SP



This sub-series has a greater accuracy than the standard M50 Series and is only available over a limited range of density. This sub-series is commonly used in the Petroleum industry and corresponds to IP 160
Range Span 0.050g/ml
Length = 270mm
Divisioned in 0.001 g/ml
adjusted at 15°C
Hydrometer Range
g/ml
Surface
Tension

Product No
0.60 to 0.65 Low 10/450/0
0.65 to 0.70 10/451/0
0.70 to 0.75 10/452/0
0.75 to 0.80 10/453/0
0.80 to 0.85 10/454/0
0.85 to 0.90 10/455/0
0.90 to 0.95 10/456/0
0.95 to 1.00 10/457/0
1.00 to 1.05 10/458/0
1.05 to 1.10 10/459/0
For trade price & delivery: Please contact us for details.

Thermometers for use with Hydrometers



BS718 : 1991 recommends these thermometers for precision work. They can be supplied with a UKAS Calibration Certificate which should be specified at the time of ordering.
Product
Range
Subdivision
Product No
A40C/Total Thermometer -0.5 + 40.5°C 0.1°C 51/061/0
B60C/Total Thermometer -21 + 61°C 0.2°C 51/066/0
For trade price & delivery: Please contact us for details.

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