This water clock is the most portable of the water clocks. Al Jazari tells that the Emporer of Artuqids asked for this clock to use when he embarks on an excursion. The reckoner rotates and indicates what time it is. The exhibit that we designed for students and visitors to observe the inner workings of the water clock mechanism is in proportion with the design of Al Jazari. Some parts of the exterior are transparent to see inside the water clock.