... , accuracy within ± 0.01MM16Net weight80kg Main Features of ZM-R680C: 1. With computer communications function, built-in PC serial port, ... , three independent heaters. 1st and 2nd heaters can be set to 8 heating, cooling, and constant temperature segments; can ... to ensure no deformation to the board. 3. High-precision K-type thermocouple with closed loop control, automatic temperature compensation ...