You get what you pay for. Everytime I grab these the batteries are dead. Why? They draw current, even when not in use. I measure ~75 microamps when on, and ~17 microamps when off. That's enough to drain the battery just sitting idle after a few months. These should come with a battery -factory-, not just a spare.
On the plus side, they are as cheap as a ruler, and measure much better than a ruler. Take the battery out after every use if you don't want to replace it next time.
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