Polycarbonate microcentrifuge tube box provides storage of microcentrifuge tubes from -150°C to +121°C (not for use in liquid-phase liquid nitrogen). Transparent lid has printed grid for inventory purposes, permits viewing of contents, and is keyed in one position to prevent misalignment. Lid accepts writing with marker for box and tube identification. Holds 64 x 1.5mL tubes or 81 x 0.2mL or 0.5mL tubes. Autoclavable.