The HAKKO FR-1012 and FR-1012B Preheaters are not
ESD safe products. If you wish to use these heaters with
ESD sensitive applications, it is recommended that you provide a ground attachment to the board holder fixture that is on the top of the preheater.
NOTE: If there is any electrical noise in the ground circuit that is attached to the board holder fixture, it is possible that the noise can induce error in the thermocouple reading when it is attached to your application. To minimize this possibility, always choose to place the thermocouple bead on the solder mask or other insulative part of the application close to the location where you with to obtain your temperature reading.