With temperature range of room temperature to 90.0°C, readable and settable to 0.1°C, EchoTherm™ Model CO20 holds columns up to 30 cm long x ¼ or 3/8 in. dia in mounting clips with room for guard columns and fittings. Larger diameter columns may be used by removing column clips. PID temperature control software regulates temperatures to ±0.1°C, and temperature accuracy and stability are ±0.1°C. Other features include temperature stability Indicator lamp, injection counter, and 30-day timer.