Inner SS 304 & Outer MS powder coated. RH 45% to 95% , Humidity Accuracy ±3% RH Temperature Accuracy ± 0,5 Resolution 0.1ºC, inner S.S. 304 Perforated adjustable trays provided. S.S. Water tank provided backside . Kettle heater type boiler for easy maintenance, PID Temp Indicator/Controller