YSI Pro ODO
The YSI ProODO dissolved oxygen meter utilizes ODO technology, an optical-based sensor, to measure dissolved oxygen. Optical-based sensors drift less than membrane-covered sensors and are capable of holding their calibration for several months. In addition, ODO sensors require less maintenance as there are no membranes to change and no electrodes to polish. ODO is a non-consumptive technology meaning oxygen is not consumed during the measurement. Therefore, no stirring is required for accurate measurements, resulting in accurate data collection every time.
Range: 0 to 50 mg/L
Accuracy: 0 to 20 mg/L (± 0.1 mg/L or ± 1% of reading)
Features:
- Field rugged design
- 5000 data set memory
- 1-point or 2-point calibration with zero cal
- Battery life = 80 hours with two C-sized alkaline
Resources:
YSI ProODO General Information 
HACH DR 900 & 890 Colourimeter Aysix TSS Meter