Argonaut Technologies, First Mate, comes in a 206-frame configuration (2 rows of 6 tubes). The FirstMate™ frame can accommodate 2 aluminum blocks each one capable of holding three varieties of glass-made test tubes (13mm x 150mm, 16mm x 150mm, or 25mm x 150 mm) with Teflon® caps. Heating and cooling requires no complex devices. Immerse the device in a dry ice/acetone bath for cooling, or use a commercially-available laboratory hotplate for heating. Agitation continues uninterrupted during both heating and cooling. Optional Hot Plate Stirrer with temperature controller. Please view additional picture.