1. Putting cotton towel on the bottom as heat preservation layer.
2. Vertically shake the Large Warmer and let the powder accumulate as one end.
Because some customers can not distinguish the front with air holes of large warmer and back side without air holes, so we used the test method of vertical type now (this test method no need to distinguish front and back side).
3. Pitting the probe on the middle side of powdered end, then use the adhesive tape to fix tightly.
4. Finally put the cotton towel on the top of large Warmer to simulate when people use it in pocket or gloves or hand, then start to test.
