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An oleo-pneumatic shock absorber having a casing, a rod slidably mounted in the casing, first and second fluids in the casing, and a gauge. The gauge has a substrate positioned on the shock absorber. The substrate has a first region with a slot sized to fit an ultrasonic transducer arranged to encom

An oleo-pneumatic shock absorber having a casing, a rod slidably mounted in the casing, first and second fluids in the casing, and a gauge. The gauge has a substrate positioned on the shock absorber. The substrate has a first region with a slot sized to fit an ultrasonic transducer arranged to encompass a range of possible oil levels within the shock absorber, a second region corresponding to a range of possible extension states of the shock absorber and a third region comprising one or more traces. Each trace corresponds to a temperature value and is indicative of an optimum relationship between the oil levels and the range of extension states at the respective temperature value associated with the trace.

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1. An oleo-pneumatic shock absorber comprising: a shock absorber casing;a rod slidably mounted in the casing;a first fluid and a second fluid contained within the shock absorber and separated by a fluid interface defining an oil level within the shock absorber;a substrate positioned on the oleo-pneu

1. An oleo-pneumatic shock absorber comprising: a shock absorber casing;a rod slidably mounted in the casing;a first fluid and a second fluid contained within the shock absorber and separated by a fluid interface defining an oil level within the shock absorber;a substrate positioned on the oleo-pneumatic shock absorber, the substrate comprising: a first region located on the oleo-pneumatic shock absorber in parallel to a range of possible oil levels within the oleo-pneumatic shock absorber, the first region comprising a slot in the substrate sized to accommodate a measurement portion of an ultrasonic transducer;a second region extending away from the first region and identifying a range of possible extension states of the oleo-pneumatic shock absorber; anda third region adjacent the first region and the second region and comprising one or more traces, each trace identifying an oil temperature value and being indicative of an optimum relationship between the range of possible oil levels and the range of possible extension states at the respective oil temperature value associated with the trace. 2. The oleo-pneumatic shock absorber according to claim 1, wherein the third region comprises a plurality of traces, each trace identifying a different oil temperature value. 3. The oleo-pneumatic shock absorber according to claim 1, wherein the range of possible oil levels are a range of possible oil levels during in-use, on-ground, conditions. 4. The oleo-pneumatic shock absorber according to claim 1, wherein the substrate comprises a plastic or metal material. 5. The oleo-pneumatic shock absorber according to claim 4, wherein the substrate comprises aluminium. 6. The oleo-pneumatic shock absorber according to claim 1, wherein the first region is arranged to define a y-axis, the second region is arranged to define an x-axis, and the third region is arranged to define a graph between the x-axis and the y-axis. 7. The oleo-pneumatic shock absorber according to claim 1, wherein the first region is adjacent an edge of the substrate. 8. The oleo-pneumatic shock absorber of claim 1, wherein the oil temperature value of each trace corresponds to a temperature of the oil as can be measured directly or through a solid part of the oleo-pneumatic shock absorber that is relatable to the temperature of the oil. 9. An aircraft landing gear comprising the oleo pneumatic shock absorber according to claim 1. 10. The aircraft landing gear according to claim 9, wherein the range of possible oil levels are a range of possible oil levels during in-use, on-ground conditions. 11. An aircraft including the aircraft landing gear according to claim 9. 12. A method of determining a need to modify a condition of an oleo-pneumatic shock absorber, the method comprising: providing the oleo-pneumatic shock absorber comprising a casing and a rod slidably mounted to the casing, and containing a first fluid and a second fluid separated by a fluid interface;providing a gauge on the shock absorber having a first region comprising a slot sized to accommodate a measurement portion of an ultrasonic transducer;identifying, within the first region of the gauge, a first point on the oleo-pneumatic shock absorber corresponding to the fluid interface;determining an extension state of the rod relative to the casing;identifying a second point within a second region of the gauge, the second point corresponding to the extension state;obtaining a measured temperature of the first fluid;identifying a coordinate in a third region of the gauge, the coordinate being defined by the first and second points, the third region comprising one or more traces, each trace corresponding to a predetermined first fluid temperature value and being indicative of an optimum relationship between a range of possible values for the fluid interface and a range of possible values for the extension state at the respective temperature value associated with the trace;identifying one of the one or more traces corresponding most closely to the measured temperature; andcomparing the coordinate with the identified one of the one or more traces to indicate whether a quantity of first fluid requires modification. 13. The method according to claim 12, whereby: the step of identifying the first point within the first region comprises moving an ultrasonic sensor within the first region to identify the first point corresponding to the fluid interface; andthe step of obtaining the measured temperature of the first fluid comprises using the ultrasonic sensor to obtain the measured temperature of the first fluid. 14. The method according to claim 12, wherein obtaining the measured temperature of the first fluid comprises directly measuring the temperature of the first fluid or measuring a temperature of a solid part of the oleo-pneumatic shock absorber to obtain a temperature measurement that is relatable to the temperature of the first fluid. 15. An oleo-pneumatic shock absorber comprising: a shock absorber casing;a rod slidably mounted in the casing;a first fluid and a second fluid contained within the shock absorber and separated by a fluid interface defining an oil level within the shock absorber;a substrate positioned on the oleo-pneumatic shock absorber, the substrate comprising: a first region located on the oleo-pneumatic shock absorber in parallel to a range of possible oil levels within the oleo-pneumatic shock absorber, the first region being arranged to define a y-axis;a second region extending away from the first region to define an x-axis identifying a range of possible extension states of the oleo-pneumatic shock absorber; anda third region arranged to define a graph between the x-axis and the y-axis and comprising one or more traces, each trace identifying an oil temperature value and being indicative of an optimum relationship between the range of possible oil levels and the range of possible extension states at the respective oil temperature value associated with the trace;wherein the first region is defined by a side face of the substrate and configured to receive a measurement portion of an ultrasonic transducer.