Nokia places a phone under a bunch of needle-sized water dispensers and then lets it drip all over the phone, which tests for resistance in situations like rain, or splashing from a pool.
Nokia also tests how the phone reacts to various liquids, creams and gels (lotions, hand sanitizers, etc...)
One of the cooler stress tests that exists is the Drop test—not only because it uses a giant friggin' machine, but also because they record the drops using a camera that can record 100,000 frames per second, which is 3,000 times faster than the normal video camera.
Tests for bending and twisting.
They also let phones roll around in a bunch of pieces of hard, pointy plastic to see where it might scratch.
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