Doppler Effect Apparatus
Economical, but strong plastic construction can be stretched up to 12 feet. An economical plastic wave demonstration spring. To better illustrate and demonstrate the fundamentals of wave motion. 
 
Dimensions :-
	
Diameter: 3 Inch (75mm)Collapsed 
	
Height: 2.36 Inch (60mm)Extended 
	
Length: 12 Ft (365cm)
	
Sold individually or at a lower cost as innerpacks of 12 pieces.