Hach DRB-200 COD Reactor digests up to 15 samples simultaneously. Reactors feature one-touch operation through the use of preprogrammed Hach COD and TNT standard digestion temperatures/times, or customize up to three programs. To customize, choose from one of nine languages, set the temperature between 37 to 165°C, and enter the time between 1‑minute to 8 hours. Built-in timer features audible alarm and automatic shut-off to prevent overheating. Transparent, locking lid covers 16 x 100-mm vials while protecting the user in the unlikely event of a broken reagent vial.