Rice Lake GF Series, A&D Weighing - Manual (Page 78)

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AD-1683 DC static eliminator
Used to minimize weighing errors due to static electricity on the material.
AD-1684 Electrostatic field meter
This option measures the amount of the static charge on the sample, tare or peripheral
equipment and displays the result.
If those are found to be charged, discharge them using the AD-1683 DC static eliminator.
AD-1689 Tweezers for calibration weight
This option is used when calibrating the balance using an external weight.
Options installed at the factory before shipment:
GX-04 Comparator output with a buzzer / RS-232C / Current loop output
Used to compare weighing data and output the results.
GX-06 Analog output / Current loop output
Used to output the weighing data as an analog voltage.