Improved design with enhanced performance and safety features Standard -30°C (-22°F) LKV3000 model, and extended range -70°C (-94°F) LKV4000 model.Microprocessor PID temperature control with two decimal calibration offset.Dual digital displays show setpoint and actual bath temperature.Selectable temperature scale - Fahrenheit or Celsius.Conformity to ASTM D445 and related specifications