Bought speed stirrer, it doesn’t even turn on

I bought a speed stirrer in March when I bought my test kit, but never used it because I never had a need to.

Now I am SLAMing for the first time, and tried to use my speed stirrer. Nothing happens. No lights, no power, no nothing. I tried changing the batteries, nothing.

Am I doing something wrong? Or is it defective?
 
I didn’t buy mine from TFTestKits, I got it elsewhere and I had to fiddle with the batteries a bit to get them seated right at first, but it has worked fine since.
 
I had some issues with my speed stir when I first got one. It did not work when I installed the batteries, so I changed the batteries, still didn't work. I took a small piece of scotchbright and cleaned the terminals and then it worked. They must get a little corrosion on the battery terminals during storage and shipping.

I would try cleaning the battery terminals with something lightly abrasive.

BTW, once you use the speed stir, you will not want to do a test without one.
 

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