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A testing method for float liquid level transmitter first prepares a testing device displaying a basic data screen and receiving basic data corresponding to fields on the basic data screen. The testing device computes the basic data to obtain corresponding standard values and displays the standard values. The testing device fetches displayed valued measured by a float liquid level transmitter and obtains error values by comparing the displayed values with the standard values. The testing device analyzes the error values to provide analyzed data and determines whether the float liquid level transmitter is qualified by reference to an error range. The testing device generates a calibration curve based on the analyzed data and displays the calibration curve.