... measurement F-JGCJ2041 Teching System Of Distance Measure With Laser PhasePurpose of the experiment and related subjects: 1. ... measurement. 4.Performance, working principle and characteristic of avalanche diode. Features of the instruments: 1.Large measuring range ... set of equipment: Experiment host, test track, 25mW laser diode, lens, avalanche diode probe, oscilloscope (self-contained) and etc..