The EchoTherm Model CB20 Constant Temperature Chilling/Heating Mini-Circulator is designed for use with small volume sample holders like water jacketed cuvettes for spectrophotometers and electrophoresis baths. The unit is Peltier based for heating and chilling and requires no compressors or CFCs. It is lightweight, compact, and takes up very little bench space. The CB20 has a temperature range from 4.0°C to 70.0°C accurate to ۪.1°C and readable/settable to 0.1°C, and a variable pumping range from 0 to 300 ml/minute settable in 1% increments. The reservoir volume is 1000 ml. The CB20 comes complete with transparent reservoir cover, 3/32 inch diameter by 4 inch long stainless steel platinum RTD probe with 3-foot long cable (a 6-foot extension is available for reaching remote samples).