I just broke my spin tester. I was took my arrows up to my pro shop to see if they can do it. The guy didn't even know what it was. He has killed several deer without spin testing. Should I just put my arrows together and shoot them all with the my Magnus Stinger 2 blade broadheads and pick the 6 that fly the best, or should I buy another tester?

Ultimately what's important is that the arrows fly tru. A spintester is great for quickly weeding out bad arrows but you should be fine if you number and shoot all your arrows and pick say the six best for hunting. If they fly true then it really dosn't matter if they are .002 off.

Just place the broadhead point down on a table or other hard surface and spin it like a top. You will immediately be able to see if the arrow is wobbling. Or, I just spin it in the palm of my hand and if it wobbles you will feel even the slightest bit.

How can someone that owns a proshop not Know what a Spin Tester is?

Don't spin that broadhead in the palm of your hand. It will cut you. Spin it on a table like a top.