Ok so I added 1g of NaCl to 1 liter of distilled water. The tds came to 1023 instead of 1000 is this close enough to consider human error or residue in measuring container? The EC reads 21/44 what does this mean. That is us/cm.
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2.3% off. I would say that’s acceptable all things considered.
Found this for a Blue Lab tester. Seems your well within range.
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You can buy a standard conductivity solution to verify your meter Or calibrate the span. if you choose. within 5% you’re good. Also the little TDS meters are not temperature compensated so depending on Temperature of fluid It can read different .
Hope that helps good luck. 
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It has temp reading on display. Do you understand the ec reading? 21/46
EC = conductivity , PPM would be about half.
1000 Conductivity with equal 500 PPM
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Ok I’ve had ppm of 2100 and ec of 2000 or is it possible was to much going on? Idk thanks I keep that in mind going on
Learned some new stuff here!! Keep it coming fellas lol!!