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Hjalmar, are you to cheap to buy batteries? LOL
I keep one or two in my tool chest. They get used quite often rather than a calculator.
Been many a year since I've had to use the old guess stick.
Wow! Haven't seen one of these in years although they standard fair in every engineers pocket at one time. First time I saw one was first day in HS Freshman Algebra class. It was a giant mock up one that was hanging above the double wide blackboard.
Not a bad one!