Description : 

On-screen tutorial messages
Two point calibration
Auto endpoint
DO range up to 300% , temperature compensated
Altitude compensation up to 4000 m
Salinity compensation up to 80 g/ L
Automatic calibration in air
GLP features
Low battery indicator

HI 9146 is a water-resistant, dissolved oxygen meter that measures up to 300% saturation or 45 ppm ( mg/ L) with temperature compensation and automatic calibration. It has been developed for DO and temperature measurement in water, wastewater, wine and applications such as fish farming.
This instrument also allows altitude compensation up to 4000 m and the ppm and % saturation are both compensated for changes in solubility of oxygen in water and for permeability of the membrane as well as the temperature effect.
The included polarographic probe features built-in temperature compensation and removable protective membrane cover.

Spesification: 

Range : O2 0.00 to 45.00 mg/ L
Range : % Saturation O2 0.0 to 300.0% 
Range : Temperature 0.0 to 50.0° C
Resolution: O2 0.01 mg/ L
Resolution: % Saturation O2 0.1% 
Resolution: Temperature 0.1° C
Accuracy: O2 ± 1.5% F.S.
Accuracy: % Saturation O2 ± 1.5% F.S.
Accuracy: Temperature 0.5° C
Calibration: automatic, in air, at 100% 
Temperature Compensation: automatic, 0 to 50° C ( 32 to 122° F) 
Altitude Compensation: 0 to 1900 m ( 100 m 326' resolution) 
Salinity Compensation: 0 to 40 g/ L ( 1g/ L resolution) 
Probe : HI 76407/ 4F with 4 m cable
Power Supply: 4 x 1.5 AA batteries / approx. 200 hours of continuous use; 
auto-off after 4 hours of inactivity; or input for 12 Vdc power adapter
Environment : 0 to 50° C ( 32 to 122° F) ; RH max 100% 
Dimensions : 196 x 80 x 60 mm ( 7.7 x 3.1 x 2.4 " ) 
Weight : 500 g ( 1.1 lb.)