1 . Stainless steel inner chamber , foursquare semicircle transition,convenient to clean ; space between shelves is adjustable. 2 . Micro-computer control system ; LCD with functions of time setting , parameter memorizing and power reset recovering 3 . Fluoride-free refrigeration and gentle breeze circulation 4 Test hole of ∅52mm at left side of container . 5 Double door seal : tempered glass silicon rubber seal inner door and magnetic rubber seal outer door , which are convenient to on/off;inner chamber with light for convenient observation. BX model additional characteristics : 1.LCD scree 30-stage program controller , round move , ladder operating 2.Sensor failure alarm