FLOCCULATION/JAR TEST APPARATUS, MODEL 1922, 1924, 1926 is a flocculation (jar) tests on water and effluent samples. A digital display clearly indicates the speed of the rotational stainless steel paddles, which can be varied from 25 to 250rpm. The digital timer can be set to count down from 1 to 99 minutes. After count down, the paddles stop and an alert sounds. The timer then counts up in minutes in order to measure settling time.