 
                 
             
                 
             
                 
             
                 
            The YSI 550A dissolved oxygen meter is a rugged, user-friendly instrument for dissolved oxygen measurement. The Pro20 can be used in the lab or the field
YSI-550A Dissolved Oxygen Instrument

Features:
* Field-replaceable DO electrode modules
* Screw-on cap membranes
* IP-67 case
* Over 2000 hours battery life
* Calibrate in either mg/L or % saturation


| Certifications | High-impact resistance, IP-67, CE | 
| Graphic Display | Graphic | 
| Measurement Range | Dissolved Oxygen-0 to 500% air saturation/0 to 50 mg/L, Temperature--5 to 45°C | 
| Multiparameter | Yes | 
| Parameters Measured | Dissolved Oxygen, Temperature | 
| Power | Low battery indicator on display, Over 2000 hours at 25°C, 4 alkaline C-cells | 
| Sampling | Yes | 
| Unit of Measure | Dissolved Oxygen-% air saturation, Temperature-°C, mg/L | 
| User Calibratable | Yes | 
| User Replaceable | Yes | 
| Warranty | 3-year instrument; 1-year DO module | 
| Waterproof | floats, IP-67 (even with the battery cover off) | 
 
    