... physics, medicine, chemical industry and other departments to do low temp experimentsFeature:1.Compressor and Oil separator: both imported from ... Danfoss original Equipment2.Ternary compound cascade refrigeration3 .high and low pressure control4.The Refrigerant R50D , R13, R145.Self- ... in product quality guarantee card, certification, and effective bill.If can not,the date, according to the factory of ...