Shopping security
Demonstrates the Doppler effect by swinging a 92dB buzzer on a 0.8m tether, revealing the shift between approaching and receding frequencies in introductory wave and sound units.
Ships within 48 hours · Estimated delivery Jun 26 - Jul 1
US$40
Get nowSign up to your membership to get coupons up to
15%
Get nowOpportunity to enjoy order discount up to 15% off
Top-Converting Item to Boost Your Average Order