just wanted to share that the ti-84 plus ce calculators have an lcd display and can be used to test if a tank is tempered. I was a little wierded out by bringing a laptop to petco. I bought a 75 by accident a few years ago and found out it was tempered.
Testing glass tanks for drilling
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redfishbluefish
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All you need is a phone and a pair of polarized sunglasses.
