Real Time also makes devices for testing dynamometers. Their purpose is to find out if dynamometers are performing with the accuracy required by their users. Without some kind of independent testing machine, it is often difficult to determine exactly how well a chassis dynamometer is simulating the road for a given vehicle.
A very innovative device, called "DynoCal", was delivered to the Bureau of Automobile Affairs (BAR) of the State of California.
Another innovative device, called the "Sierra Research Dynamometer Tester", has recently been delivered to several customers. The idea for this tester originated with staff at Sierra Research in Sacramento, CA.