RIPPLE TANK ADVANCED WITH PROJECTION SCREEN 220V archive pending and hygrometer in a single and hygrometer in a single classroom scale unit for monitoring room conditions at a glance 5 inch mounting rod giving 5 inches total length for standard optical bench setups No Need for Separate Overhead Projector Electronic strobe and control Inbuilt projection screen for easy view Foam beaches on tank Wave Generator unit Full range of accessories are included This advanced ripple tank from EISCO comes complete with all accessories needed for wave investigations The frame is made of reinforced plastic and with foam beaches ( to negate reflections) There is a mirror which can be mounted at 45 degrees to project the ripples onto a translucent screen on one side of the unit