Designed to determine the protein content of food on a macro scale-from 100 to 800 mL. Run several projects simultaneously using these multiposition macro-kjeldahl extraction heaters. Heaters are available with two or six individually controlled heating mantles that accommodate either 100 to 300 mL vessels or 500 to 800 mL vessels. Back-mounted brackets hold flask support rods up to 12.7 mm in diameter.