Our 750 Series II Conductivity/TDS and Resistivity Monitors and Monitor/Controllers can be “Re-Ranged” with a new range module to meet you changing needs. Simply un-plug the old range module and plug in the new range module into the circuit board.
Refer to page 8 of the Operations Manual to see the Range Selection guide and to see if any minor modifications are necessary.

Source: Myron L FAQ

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