Lenpure Bench-top Precise Drying Oven Model LRHS-U9023A LRHS-U9053A LRHS-U9070A LRHS-U9140A LRHS-U9240A Interior Dimension (mm) 340 x 325 x 300 420 x 395 x 350 450 x 400 x 450 550 x 450 x 550 600 x 500 x 750 Temperature Range Ambient plus 10 degrees Celsius to 300 degrees Celsius Control Accuracy ¡À1% (full scale) Temperature Fluctuation ¡À1 degree Celsius Temperature Resolution 0.1 degree Celsius Controller P.I.D. with LED backlight digital displayer, plus SSR microchip integrated controller Heating System Nickel-chrome alloy electrical heater Temperature Timing 1 ~ 9999 Minutes