When testing the tile, use a sharp object to scratch its surface. If scratches appear easily, it indicates that the glaze is not durable and may wear off over time, making the tile harder to clean after polishing. A high-quality tile should have clear and natural colors, while a lower quality one may look dull or inconsistent in color. When purchasing, check the surface under normal lighting within one meter. If you can see pinholes, it suggests that the glaze hasn’t fully fused, which could lead to dirt accumulation over time. 1. Place a few drops of tea or water on the back of the tile. After a few minutes, observe how quickly the liquid is absorbed. If the tile doesn't absorb much moisture, it means it has a low water absorption rate, which is a sign of better quality. 2. Tap the tile gently with your fingers or a small object. A crisp, ringing sound indicates a denser and harder ceramic, which is usually of higher quality. A dull sound may suggest lower density and weaker structure. 3. Use a sharp object to test the surface for scratches. If the glaze is easily scratched, it may be less resistant to wear and could become difficult to clean once worn down. 4. Examine the tile’s color. High-quality tiles will have a clear, natural appearance, while lower quality ones may look washed out or uneven in tone. 5. Check for pinholes on the surface by looking closely at a distance of about one meter. The presence of these tiny holes suggests incomplete glazing, which can make the tile more prone to staining and dirt buildup. 6. Inspect the edges of the tile for warping. Hold it up to the light and check if the sides are straight. Severe warping can affect the tile’s stability and installation, leading to potential issues over time. Orifice Plate Flowmeter,Orifice Type Flow Meter,Orifice Plate Flow Meter,Orifice Gas Flow Meter Jingsu Huaerwei Science and Technology Group Co.,Ltd , https://www.hewflowmeter.com