![Charging Base for RKI Instruments GX-2009 Charging Base for RKI Instruments GX-2009](https://cdn11.bigcommerce.com/s-64cbb/images/stencil/500x659/products/903/2864/GX-2009_Charger__99678.1648459184.jpg?c=2)
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RKI Instruments Item: 21-1882RK
The RKI GX-2009 Sensor Retainer holds the gas sensors in place and snaps onto the bottom of the case. It has 4 diffusion ports, one for each sensor, and has recessed areas in it for the charcoal filter, and the H2S removal filters.