Using 3d glasses from the movies and a computer lcd monitor will let you know if it's tempered or not. So when you have to drill the glass it doesn't explode on you...Never drill tempered glass it will shatter... 
Just a little video I made. I did not come up with the idea, but I thought I would share.
Oh and I am not responsible for any tank that has been drilled and cracked or broke/shattered on you because you used this method...
[YT]-xiD7C0hLX4[/YT]
Just a little video I made. I did not come up with the idea, but I thought I would share. Oh and I am not responsible for any tank that has been drilled and cracked or broke/shattered on you because you used this method...
[YT]-xiD7C0hLX4[/YT]
