Omega Engineering”s DOH-20D is a portable microprocessor-based dissolved oxygen meter with a custom digital LCD screen that displays large numbers for easy reading. The LCD screen can show dissolved oxygen (DO) in either mg/liter or percent of saturation and temperature simultaneously. Features memory storage, recall with data hold function, and the ability to store up to 16 sets of temperature and DO values. The user can utilize the RS232 (optional) feature to download stored values into a computer. The meter comes equipped with battery saving features and will shut down automatically after 10 minutes of being idle. Low-battery and consumption indicators are also included. The product is a good fit for biological testing, wastewater treatment, environmental testing within water and wastewater, and chemical treatment applications. The DOH-20D comes with a sensor, two membrane caps, 20 mL of electrolyte, pipette, a rubber protective cover, 9 V battery, operator”s manual, and a one-year warranty.