deliver accurate powder weighing. Safety when weighing potentially toxic or active substances is of paramount importance in industries such as chemical, pharmaceutical and biotechnology. The XPR Automatic supports accuracy, repeatability and safety by dosing from an enclosed head into target vials or capsules with openings as small as 6 mm in diameter. It then uses live feedback to learn a substance's flow characteristics and improve dispensing efficiency in real time. This can be particularly effective when combined with a sample changer that can process as many as 30 samples in one automated run. Direct dosing reduces the kind of airborne exposure risk to lungs and eyes that spatula use represents. Spill risk is also eliminated, as is the need to repeatedly open the balance door and transfer compounds from the main container into a secondary container. The balance can be operated inside a glove box or safety enclosure. - Mettler Toledo, Columbus, Ohio www.mt.com/lab Heat or chill HPLC columns with this unit The EchoTherm Model CO50 (photo) is a programmable chiller/ heater for high-performance liquid chromatography (HPLC) columns. The unit has a temperature range from 4.0 to 100.0°C (readable and settable to 0.1°C). The PID control software regulates temperatures to ±0.2°C, even at ambient conditions. The CO50 has an LED indicator that illuminates when the target temperature is stable to within ±0.2°C. The Peltier-based CO50 has five-program memory of 10 steps per program and the ability to repeat any program from 1 to 99 times automatically. It is suitable for chiral and biomedical chromatography where below ambient temperatures help preserve bioactivity. It can be used for stabilizing column temperatures from day to day at or near room temperatures for repeatable results. The CO50 holds columns up to 30-cm long with 1/4- or 3/8-in. diameter mounting clips provided. Largerdiameter columns can be used by Mettler Toledo Torrey Pines Scientific CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM For details visit adlinks.chemengonline.com/80074-11 OCTOBER 2021 21http://www.mt.com/lab http://adlinks.chemengonline.com/80074-11 http://WWW.CHEMENGONLINE.COM