Porcelain crucibles used for total suspended solids determinations. Units have perforated bottoms and are glazed inside and outside except for the outside bottom and rim. Perforations are 0.7mm in 13 to 40mL sizes and 1mm in 130mL size. Sold without covers, which are available separately. Crucibles are also offered in case quantities. Contact Krackeler Scientific Customer Service for details.