This pocket-size meter has a rugged casing that is waterproof, floats, and is ideal for all conditions. 
Graphite sensor provides greater accuracy, preventing buildup of salts or other contamination. 
Features % battery power indicator, 500 continuous-hr use rating and 8-min auto shutoff. 
This is the ideal meter for rivers, ponds, aquariums, hydroponics, fish farming, pollution control, and a wide variety of other environmental applications. 
Four 1.5-V batteries and instructions included.
 
Accuracy
±2% full scale
Calibration
1 point (automatic)
EC Range
0 to 3,999 µS/cm
EC Resolution
1 µS/cm
TDS Range
0 to 1,999 ppm
TDS Resolution
1 ppm
Temperature
0 to 60° C (32 to 140° F)