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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