1. The heat preservation of the steam and water connecting pipe is good.
2. Water level gauge is complete and clear.
3. The steam valve, water valve and water drain vale shall be tight and don't leak, and can be opened/closed flexibly.
4. Water meter gauge scale is right and has obvious signs at the high and low limit water level.
5.  It is provided with protective shield to prevent people be scalded during washing.
6.  Near the water level gauge, there is sufficient lighting, the camera position is correct,  so the camera can accurately and clearly monitor the  water level. (hxl)