•   What kind of glass and what’s the thickness for your digital glass bathroom scales?
It’s made of tempered glass. As to the thickness, 6mm and 8mm for option. 
 
•   How many times the CR2032 battery can be used? And how about AAA battery?
15,000 times for CR2032, 4,000~5,000 times for AAA battery.
 
•   How to turn on the scale?
Some are turned on by tapping on, some by stepping on. 
 
•   What is the capacity of the bathroom scales?
150kg or 180kg.