Does Hach carry a zero dissolved oxygen standard?
availability for zero standard for dissolved oxygen.
Zero standards for dissolved oxygen are only viable for 30 minutes after they are prepared. Unfortunately this means that It's impossible for a prepared standard to be available for purchase. For more information and instructions on how to prepare a zero standard see When is it recommended to perform a zero calibration on the IntelliCAL™ LDO101 Standard Luminescent/Optical Dissolved Oxygen probes?