Has Anyone Tried an Electronic Salt Testing Device?

I use eSeasonGear SALT-3000 Meter, Digital Salinity PPM Temperature Tester for Salt Water Pool and Koi Fish Pond bought from Amazon.
 
The “stores” are for parts and part numbers but when you click on the links the seller can be either Amazon, the manuf, or any random seller. There is a link to “see other sellers” and sometimes I’ll go looking for a seller I recognize or amazons own listing even if it’s a few dollars more. There is so much junk on Amazon these days ….
 
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