Digestion units of the behrotest® InKjel series are fitted with a high power infrared heater. The quality and positioning of the behr infrared heater guarantees the user identical heating phases and digestion temperatures at all sample positions. This also applies to the double-row arrangement in racks for 12 samples. The glass digestion vessels are suspended in the rack and are not deposited on the bottom of the digestion unit. Therefore the digestion vessels are less susceptible to breakage than in an aluminium heating block.