Ripple Tank Projection with Strobe & Frequency Meter. LED stroboscope (adjust & read frequency 30 to 100Hz in 0.1Hz steps). Screen size 32 x 32cm allows a very detailed and clear image. Tank is 32 x 38cm. Wave properties such as Reflection, Refraction, Diffraction, Interference, speed of propagation, Doppler effect etc can be shown. With detailed instructions, drawings and accessories to do all the experiments.