1. first of all, note that cover is appropriate, as we know, ceramic lid can let water cool so quickly, cover if the lid does not fit, so may be defective, can also affect the future use.
2. listen to sounds, finger-flick, if produce crisp, melodious voice, this fine dense solid porcelain, hoarseness, for inferior China, do not buy.
3. drink plenty of water when I come in contact with the glass, so glass walls at the top, where mouth contact have no pattern, and had better not be a pattern on the inner wall. Decorative glaze and because they contain trace amounts of lead, cadmium and other heavy metals, not for long-term use. Harmful to the human body.
4. touch the surface. Smooth, no cracks, holes, spots, smooth as glass, the better.
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