Add to Cart Compare Quick view RKI Ammonia (NH3), 0-400 ppm, for GX-6000 & GX-6100 Replacement Sensor RKI Instruments MSRP: Now: $275.00 Was: MSRP: Now: $275.00 Was: Add to Cart Compare Quick view Qty in Cart: 0 Quantity: Decrease Quantity of RKI Ammonia (NH3), 0-400 ppm, for GX-6000 & GX-6100 Replacement Sensor Increase Quantity of RKI Ammonia (NH3), 0-400 ppm, for GX-6000 & GX-6100 Replacement Sensor Price: MSRP: Now: $275.00 Was: Subtotal: Add to Cart