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YSI™ Professional Series DO, ODO and DO/Conductivity Meters

Compact, handheld instruments provide user-selectable cable lengths and probe options.

Manufacturer:  YSI™ YSI6050020

Catalog No. 15-177-452

Includes: Meter, two alkaline C-cells, instructions



Choose the Pro20 for a dedicated, single-probe DO meter. Choose the Pro2030 to measure both DO and Conductivity. With both, you get:

  • IP67 waterproof rating, even with battery cover off
  • Auto temperature, salinity, barometric compensation
  • Choice of 4, 10, 20, and 30m (13, 32, 65 and 98 ft.) detachable cables
  • Fuel gauge continuously displays battery level
  • User selectable polarographic or galvanic DO sensors with screw-on cap membranes
  • EPA approved DO methodology
  • Backlit display and keypad
  • User-upgradeable software via USB communications
  • Graphic display with detailed messages and instructions

Pro20 features:

  • DO range of 0 to 50mg/L, 0 to 500% air saturation
  • User-selectable resolution of 0.1 or 0.01mg/L, 1% or 0.1% air saturation
  • Temperature range of -5° to +45°C
  • Choice of DO/temperature cables in 4, 10, 20 and 30m lengths
  • USB connection for software upgrades
  • 1000 satasets with date/time stamp plus GLP, manual or logging, user-selectable rate
Pro2030 adds:
  • Conductivity range of 0 to 200mS/cm, using 4-electrode cell with autoranging
  • Salinity range calculated from 0.0 to 70.0ppt
  • Total Dissolved Solids range calculated from 0 to 100g/L
  • Choice of DO/temperature cables in 4, 10, 20 and 30m lengths
  • Choice of Conductivity/temperature probes with attached cables in 4, 10, 20 and 30m lengths

Order Info

Dimensions: 8.5L × 3.25W × 2.25 in. H (21.6 × 8.3 × 2.3cm) Net weight, with batteries: 1 lb. 1 oz. (475g).


EPA approved DO methodology


Three years for the instrument; two years for the cables; one year for probes



450 hr.
pH, DO
2.3 cm
21.6 cm
1 lb.
3.25 in.
IP 67
C Alkaline
Stores 50 data sets with date/time stamp
2.25 in.
Meter, two Alkaline C-cells, instructions
3 Years
0.475 kg
LCD Graphic, Backlit
0°C to 45°C
Product Certifications