Jet-Care US Laboratory is awarded American Bureau of Shipping (ABS) Service Supplier status.

Find out more in the News section.

Spectro | Jet-Care launch new sample kits for marine customers

Find out more in the News section and on the Marine Sample Kits page.

Spectro | Jet-Care confirm compliance with new hydraulic fluid sampling requirements of Airbus OIT

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Spectro | Jet-Care Updates regarding Coronavirus (COVID-19)

All our laboratories remain open - please read the latest information in the News Section of our website.


We are specialists in our field and understand the time, safety and maintenance pressures you face. Our comprehensive range of services, including oil, hydraulic fluid, fuel, debris and filter analysis, is tailored to your specific requirements so you always have the resources available when you most need them.

Relative Density or Specific Gravity

Measurement of relative density or specific gravity can be used to confirm that the correct fluid is in use by comparison of the result against product specification. The sample is injected into an oscillating tube, the change in its oscillation is directly proportional to the density of the fluid.  The determination can be carried out using a Digital Density Meter, and can also be used to calculate concentrations of one fluid in another (if the densities of both fluids are known).