DO Meter & pH Meter
Lutron Make,
Model : YK-2001DO
Features:

Price:
Power Supply : 4 x 1.5V AA batteries
Measurement Range : 0.0 20.0 mg/L
Power Consumption : ~150 mW
Humidity % : 85% RH
Material : ABS plastic body
Temperature Range : 0C 50C
Power Supply : 9V DC battery
Measurement Range : 020.0 mg/L (O2)
Power Consumption : Low
Humidity % : 80% RH
Material : Plastic housing
Temperature Range : 0C to 50C
Power Supply : 230V AC, 50Hz
Measurement Range : 020 mg/L (O2)
Power Consumption : 10 W
Humidity % : Up to 90% RH
Material : ABS Plastic body
Temperature Range : 0C to 50C