The single most useful chamber for the TLC laboratory is a sturdy, molded-glass block of clear glass with flat surface walls, ground lip of uniform flatness, beveled inside and outside to remove any sharp edges. There is a raised ridge midway on the inside ends and bottom of the jar. Inside dimensions measure 27cm D x 7cm W x 26cm H (10 5/8 x 2 7/8 x 10") and weighing 15 pounds. The lid is flat, weighing 1 pound and measures 30 x 10 x 3cm (11 3/4 x 3 7/8 x 3/16"). Also available s a non-slip lid with Teflon® retainers inside and an external knob for easier lifting of the lid. Racks are 24 gauge stainless steel measuring 19cm W x 7cm D (7 1/2 x 2 3/4") weighing one pound. Another rack is aluminum multiplate and is hard anodized that measures 21cm W x 6cm D (8 1/4 x 2 1/2") also includes a stainless steel handle. (Jar alone will make an excellent museum, battery, or specimen jar.)