Question 1

Does this measure salt (NaCl) or sodium (Na) ?

Accepted Answer

It measures salt (sodium chloride).

Question 2

What calibration and conductivity solution do I use ?

Accepted Answer

ORAPXI salinity meter has 3-point-calibration, which means you can calibrate the meter with 1413 μS/cm, 12.88 mS/cm, 111.8 mS/cm solution seprately.
Depending on your application needs. If you test hydroponic nutrient, the tester need to be calibrated 1413 μS/cm solution. If you test saltwater pool, the tester need to be calibrated 12.88mS/cm solution. If you test aquarium tank, the tester need to be calibrated 111.8 mS/cm solution. If you test all application, the tester need to be calibrated 1413 μS/cm, 12.88 mS/cm, 111.8 mS/cm calibration solution.
All calibration solutions can be purchased at Amazon by searching for "1413 μS/cm calibration solution"，"12.88 mS/cm calibration solution", "111.8 mS/cm calibration solution".

The calibration steps are as follows：
a) Prepare 1413 μS/cm standard solution, press POWER button to turn it on.   Insert the tester compound electrode into the standard solution;
b) Press MODE/CAL button, adjust the tester to EC mode, the word “μS/cm” will be displayed at the left top of the screen.
c) Press MODE/CAL about 4 seconds, then release the button, the “CAL” symbol will display, then a value will flash 3 times on the screen, when the value starts to flash, press down button( If the flashing value is higher than 1413μS/cm ) or up button ( If the flashing value is less than 1413μS/cm ) to adjust the reading toward 1413μS/cm.
d) After adjust the displaying value to 1413 μS/cm, then release the button, waiting the reading stop flashing, the calibration is finished.
The 12.88 mS/cm and 111.8mS/cm solution calibration is the same as above procedures.

Question 3

Does this measure salt (NaCi) or sodium (Na) ?

Accepted Answer

Measures salinity.  I use to measure the salinity in my reef tank.

Question 4

can this unit also show Celsius

Accepted Answer

Yes, I believe it does, though it isn't sitting in front of me at the moment.  I have found this perfect for my 600 gallon goldfish pond.

ASIN	B08GC7JCV3
Brand	ORAPXI
Brand Name	ORAPXI
Customer Reviews	4.3 out of 5 stars 1,644 Reviews
Included Components	3 LR44 batteries
Item Length	18.3 Centimeters
Manufacturer	ORAPXI International
Model Number	LD-154
Number of Packs	1
Part Number	LD-154
Recommended Uses For Product	Salt water, seawater, aquariums, marine monitoring, koi fish pond
Recommended uses for product	Salt water, seawater, aquariums, marine monitoring, koi fish pond
UPC	736139474435
Unit Count	1.0 Count
Unit count	1.0 Count

Digital Salinity Tester for Salt Water - Waterproof IP67 Salinity Meter with ATC Large Range 0-200ppt Saltwater Tester for Seawater, Aquariums, Marine Monitoring, and Koi Fish Pond

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