Empire TC09 48-Inch Level, 9-Inch Torpedo Level, and Hard Plastic Case Set True Blue vials are accurate to within 0.0005" per inch in all 10 level and  plumb working positions Super strong anodized I-beam frame. Shock-absorbing end plates and top read window. 300 view top-reading level vial Solid block acrylic vials won't break, leak or fog Life time warrantee