I really like the hanna handheld salinity (EC/conductivity) tester. #HI98319.
get some calibration fluid to check it every now and again. I've gone to using it as my main salinity checker now. Its just too convenient not too.
Salinity Accuracy
±1 ppt for 0.0 to 40.0 ppt; ±2 ppt for...
Love my hanna salinity/temp(model #HI98319) so easy to use. My milwuakee and refractometer sit on the shelf other then the double check the hanna once in a while.