Orp Calibration Fluid

…with all temp, pH, conductivity and ORP probes including Neptune Apex Temperature Probe Magnetically mounts to Glass or Acrylic up to 12mm (0.45 inch) The magnetic coupled, padded holder will allow you to easily maintain your probes for cleaning and calibration, without having to mess with finicky…

…with all temp, pH, conductivity and ORP probes including Neptune Apex Temperature Probe Magnetically mounts to Glass or Acrylic up to 8mm (0.30") The magnetic coupled, padded holder will allow you to easily maintain your probes for cleaning and calibration, without having to mess with finicky thumb…