The Cars Speedometer SPED 3400 was designed from the basis of a brake tester bench with balanced rollers, where we have sought an economical solution to check Speedometer.

 
In this case the SPED 3400 is configured with options for cars Speedometer testing including a driver motor controlled by a inverter drive and mechanical blocking rollers (free wheel bearing), so using this model version is not necessary to install pneumatic air inlet.