+GF+ Signet
9900: Module-Conductivity Accessory
![9900: Module-Conductivity Accessory](/sites/default/files/styles/list/public/images/product/default/3-9900.394.jpg?itok=oqQ_FR4z)
Direct Conductivity/Resistivity Module. The Direct Conductivity/Resistivity Module interfaces Signet 2819-2823 and 2839-2842 Conductivity electrodes directly to the 9900.
9900: Output Accessory
![9900: Output Accessory](/sites/default/files/styles/list/public/images/product/default/3-9900.398-1.jpg?itok=CbLpvGME)
The 4 to 20 mA Output Module adds a second 4 to 20 mA Output to the 9900 Transmitter (Generation III and later). Each of the outputs can be used to output the primary and/or secondary measurement.
9900: Relay Accessory
![9900: Relay Accessory](/sites/default/files/styles/list/public/images/product/default/3-9900.393.jpg?itok=ApkBTNpn)
Relay Module. This module adds two programmable dry-contact relays to the standard Open Collector output in the base unit.