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Instrument for aquiculture
Model pH51 C65 C66
Range 0.0-14.0pH  0-1999 µS/cm 0.00-10.00mS/cm
Resolution 0.1 pH  1 µS/cm 0.01 mS/cm 
Accuracy ±0.1 pH ±2% Full scale ±2% Full scale
Calibration  Manual 2 points Manual 1 point  Manual 1 point 
Electrode Replaceable MA73600  Replaceable MA73075  Replaceable MA73076 
Environment 0 to 50°C;100% RH 0 to 50°C;100% RH  0 to 50°C;100% RH 
 Temp. Compensation -  Automatic 0 to 50°  Automatic 0 to 50°
Battery type  3 x 1.5V  3 x 1.5V   3 x 1.5V 
battery life 1500 hours of continuous use 250 hours of continuous use 250 hours of continuous use

easy to replace electrode
manual calibration
pH glass electrode
Model T75 T76
Range 0-1999ppm  0-9990ppm
Resolution 1ppm  10ppm
Accuracy ±2% Full scale ±2% Full scale
Calibration  Manual 1 point Manual 1 point 
Electrode Replaceable MA73075  Replaceable MA73076 
Environment 0 to 50°C;100% RH 0 to 50°C;100% RH 
 Temp. Compensation  Automatic 0 to 50°C  Automatic 0 to 50°C
Battery type  3 x 1.5V  3 x 1.5V 
battery life 250 hours of continuous use 250 hours of continuous use
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