- Beveled inside and outside to remove any sharp edges
- Raised ridge midway on the inside ends and bottom for developing two 20 x 20 cm plates or the equivalent
- Inside dimensions: 27 x 7 x 26 cm
- Supplied with flat glass lid, 30 x 10 x 3 cm
Molded glass block of clear glass with flat surface walls, ground lip of uniform flatness.