Eddy current (EC) dynamometers are currently the most common absorbers used in modern chassis dynos. Fuel consumption and emission tests are performed on chassis dynamometers. Electric motor/generator dynamometers are generally more costly and complex than other types of dynamometers. Many NVH facilities will have semi-anechoic chambers, and rolling road dynamometers. Additionally, MAHLE Powertrain performs drive-cycle emissions testing on in-house dynamometers. Electric motor/generator dynamometers are a specialized type of adjustable-speed drive. Powder dynamometers are typically limited to lower RPM due to heat dissipation problems. For more specific dynamometry of the intrinsic muscles, intrinsic hand dynamometers have been developed. In contrast, the high-end AC-motor dynamometers cleanly return the engine's power to the grid. Froude Ltd, of Worcester, UK, manufactures engine and vehicle dynamometers. Desaguliers modified the first dynamometers, and so the instrument became known as the Graham-Desaguliers dynamometer. Reliability and validity of this dynamometer is comparable to grip- and pinch dynamometers. These engine and chassis dynamometers would be commissioned within 2016 and strengthen RAL R&D efforts. Dynamometers are useful in the development and refinement of modern engine technology. Conversely, performance engine dynamometers tend to utilize low-inertia, high RPM, liquid-cooled configurations.