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		 I have been using a Showdown Ice Stroller for a few years. 
Being a bar graph display is relatively simple to understand. 
It uses 6 AA batteries but has the option of using a 12v battery. 
 
Although it's designed to be carried around your neck on a lanyard, I got the "performance pack" which has it mounted in a carrying case which can hold a 12v battery in its base. 
 
Regardless of what type you get, make sure you understand the basic operation and limitations of the model you get. 
 
I love mine and it's made jigging a whole lot more fun!!! 
		
		
		
		
		
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