https://www.controldesign.com/directory/product/11334425/precision-digital-industrial-networking-precision-digitals-super-snooper-line-of-modbus-scanners
Industrial Networking: Precision Digital's Super Snooper Line of Modbus Scanners | Control Design
The meters provide two independently programmed analog inputs and an array of math functions for sum, difference, average and ratio calculations.
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