An A/C performance check can now be done in just two minutes with this all new tool. in two minutes the CarSmart AC Inspector indicates whether the A/C system is operating within OEM specification by It compares outside air and temperature to the temperature coming from the center vent. Providing customers with professional onscreen or printed reports helps promote A/C service, such as a system charge or repair, while giving you the peace of mind in knowing that the technician is providing a high quality and accurate service.