The Cars Speedometer / Taximeter SPED3400 was designed from the basis of a brake tester bench with balanced rollers, where we have sought an economical solution to check Speedometer and Taxi fare.
In this case the SPED3400 is configured with options for cars Speedometer and Taximeters fare 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 pneumatic air inlet.