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Reversible IsoFreeze racks for 20 tubes of 0.5 ml or 20 tubes of 1.5/2 ml. Made of polycarbonate. Numbered spots. Size with lid: 108 x 172 x 104 mm. The white model (M-570) can maintain a temperature of 0 ºC for 5 hours, while the blue model (M-571) can maintain a temperature between -10 ºC and -20 ºC for up to 3 hours. IsoFreeze racks for 96 tubes of 0.2 ml PCR tubes or a plate. Made of polypropylene. Can maintain temperature of 4 ºC for almost 3 ½ hours. Gradually colour change from green to yellow in line with increasing temperature. Dimensions with lid: 141 x 99 x 44 mm. Dimensions without lid: 141 x 88 x 38 mm. Must be freezed at least 8 hours at -20 ºC prior to usage. Find supplementary cooling racks by Carl Roth.