Waterproof EC test meter.
 
Be more accurate with your feeding solutioins with this EC pen from Platinum Instruments.  
 
Range: 0 - 19.99 EC,
Accuracy: ± 2% FS,
Resolution: 0.01 EC,
Scale conversion: 1.0 EC = 700ppm,
Battery: x2 CR2032,
 
1.41 Calibration fluid included.