AS10 capacitive fuel sensor is the priority option among above options. It is an economic, mature, adaptable and safe solution. However, the AS10 fuel sensor can’t cover all applications. If the customers have below problems: - Customers refuse to drill a hole on the fuel tank, at the same time need high accuracy fuel monitoring, ultrasonic fuel sensor is recommended. However, the ultrasonic need higher installation skills and the price is around usd30 higher than the AS10 fuel sensor. - Customers want to monitor the small car fuel. Both the AS10 fuel sensor and ultrasonic fuel sensor are not suitable for most small cars, so the original fuel sensor solution (using vehicle existing built-in fuel sensor) becomes a solution accepted by part of customers. However, this solution accuracy is only around 90%, but cost is 0, only need buy GPS tracker itself. - Customers have stationary big container like 5 meters height need to monitor level. The liquid sensor is the most suitable solution both on cost and installation convenience considerations. However the liquid sensor is not suitable for moving objects.