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✅Turn your masterpiece in to a fridge magnet and keep the artwork on display
24 pentagons
IEC Photoelectric Cell on Base with Terminals and 90CG Photoelectric Tube
small internal resistance
automatic control of heating
Tunning Forks on Resonance Box Force ✅Turn your masterpiece in toHigh quality physical experimental instrument, durable and practical. Two tuning forks of the same efficiency are made of the whole carbon steel. The edges and corners are neat and the surface is chrome plated, the frequency is 440 cycles per second. The tuning fork set is used to demonstrate the resonance of sound in school. Can be used as a general tuning fork of a variety of experiments, such as the sound of the occurrence, interference, sound
