RIPPLE TANK ADVANCED WITH PROJECTION SCREEN 220V Coating_Vinyl this rare dinosaur era fossil collection this rare dinosaur era fossil collection exposes students to prehistoric life forms for biology and earth science lessons 45 degree projection mirror onto a 13 x 11 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