... low & high temp liquid pollution .5. Digital display, clearly, operate easily6. Multi-function (cooling,heating,circulating),reasonable power ,save lab ... it has Delay, overheating, overvoltage etc many protection function.Technical Parameter:Model20/-30/200°C30/-30/200° ... be extended for three months. Products advantages:1. Multi-function heating refrigerating, circulating2. Safe device is advanced.3. ...