Go Direct* Hand Dynamometer, Measure grip strength, pinch strength, and muscle fatigue wirelessly, Resolution: 0.1 N, Range: 0 to 600 N, Safety Range (maximum force without damage done to sensor): 0 to 850 N, Connections Wireless: Bluetooth, Wired: USB
vertically-aligned set LED, easy and dramatic demonstration of the relationship between the color and wavelength of light, spectral range of each LED can be investigated with spectrometer, or just viewed for comparisons with each other