TrueDos D and TrueDos M dosing pumps from Alldos Ltd., of Birmingham, England, incorporate stepper motor technology. The pumps can measure the actual or true volume per stroke that the pump outputs. It’s possible to set a dose rate and the pump regulates its output to the desired output. Key to this pump is the patented and successful Plus 3 dosing pump and additional ultrasonic level sensor as well as a magnetic solenoid valve with the next generation of the company’s electronics.