All Models are Microprocessor Controlled. Automatic Ramp rate/PID technology. Auto gradient rate of heating control for high precision. "HOLD action power failure in all Models. Useful for (Melting Point Pharmaceutical Industry Temp, achieved) is protected from Chemical/ Plastic industries etc. Suitable for Melting/Boiling Point, Readability in 1-C, Resolution C Programmable, Visual provision by Optical Magnifier, Automatic Ramp Rate Proceeding Auto Gradient Rate of Heating Control Melting View: Magnifying display of melting operation with the help of magnifying glass, Melting point reading hold on by activating the "MELT" key & "RESET" is not activated