Windbell is a well known company in the retail petroleum equipment industry in China. The main products of Windbell and its holding companies focus on retail station equipments, vapor recovery system and safety monitoring. Automatic Tank Gauges (ATGs) is one main product of Windbell Company. As one of the leading manufacturer of ATGs in China, Windbell acquired various patents on ATGs and significant market success in the past years. Currently, Windbell ATGs has been installed over 20 provinces all over China under various environment conditions from extra low temperature to high and moist temperature. The excellent performance has been widely accepted by retail customers.