Ammonia and Nitrate Kit Purchased

Kits were purchased to extend water testing. Up until now we have tested PH, Salinity (Conductivity), Temperature. We are missing a probe for the DO (Disolved Oxygen) meter and the probe for the Datalogger is not working. We are investigating additional probes for our current dataloggers for Ammonia, Nitrate etc. readings are recorded in a spreadsheet and tracked to monitor changes.