Calibrating Tds Meter Question

[Snakeskins]

I have a Etekcity tds meter which I'll use to measure my tap water with for my soil grows but I'm confused about the testing liquid I bought. I don't know what unit of measurement to look for when adjusting the actual device.
On the bottle it says:

1500 ppM (NaCI scale)
2190 ppM (442 scale)
2930 S (microSiemens)

Does anyone know what those numbers mean and what numbers I should calibrate to?

 

[Bannacis]

I believe the naci scale 1500 ppm. the meter is factory calibrated to 342 ppm naci.
What does your meter read when put in solution? it should be close to the calibration liquid. they do not stray to far off cal.

 

[Snakeskins]

I believe the naci scale 1500 ppm. the meter is factory calibrated to 342 ppm naci.
What does your meter read when put in solution? it should be close to the calibration liquid. they do not stray to far off cal.

Since I last calibrated, it reads like 1499 or something when using the testing liquid. The lowest the numbers will go is to the 1400s.

 

[Bannacis]

Then 1500 is your calibration number