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Hotline Stress Tester


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Used properly, the Hotline Stress Tester will assure compatible glasses.

To observe stress, place the fused glass test strip over the polaroid filter.  Hold the second polaroid filter closely over the fused strip, sandwiching the glass between the filters.  Rotate the filter until the maximum light blockage occurs.  At this point, a halo or flare will appear if excess stress is present. The halo will not appear if stress does not exist.

The Stress Tester is best used with a Battery torch commonly available from a hardware store.  It can, however, be used with any light source.


For instructions on how to test for stress in glass, click here

  • Model: Stress Tester
  • Shipping Weight: 0.1kgs

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Hotline Stress Tester

Hotline Stress Tester

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