This is a fully automatic apparatus designed to determine the total vapor pressure of air-containing, volatile liquid petroleum products in accordance with ASTM D5191 standards. It offers several notable features, including embedded operation software with a touch display screen, fully automatic operation to eliminate human errors, a self-diagnostic function, and dynamic display of the test process. The apparatus also provides various connectivity options through COM port, Ethernet for LIMS, and a USB port for flash memory. It boasts a large storage memory for storing historical results and a patented auto-drain design for waste liquid. Each test requires only a 3ml sample and takes approximately 7 minutes to complete.