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

It measures salt (sodium chloride).

What calibration and conductivity solution do I use ?

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.

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

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

can this unit also show Celsius

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.

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🌟 Dive into precision—never miss a drop of accuracy!

ALL WEATHER READY - IP67 waterproof design ensures reliable performance even in wet, marine, or pool environments.
EFFORTLESS OPERATION - Simply dip and read—no complex setup, perfect for busy professionals managing aquatic environments.
SEE CLEARLY ANYTIME - Green backlit LCD display guarantees easy reading in low light or underwater conditions.
PRECISION MEETS POWER - Accurately measures salinity, TDS, EC, and temperature in seconds for total water quality insight.
VERSATILE SALINITY SOLUTIONS - Ideal for saltwater pools, aquariums, koi ponds, and marine monitoring—one tool for all your needs.

The ORAPXI Digital Salinity Tester LD-154 offers a broad 0-200ppt salinity range with automatic temperature compensation for precise readings. Its IP67 waterproof rating and green backlit LCD make it perfect for professional-grade testing in saltwater pools, aquariums, and marine environments. Lightweight and battery-powered, it delivers quick, multi-parameter water quality analysis with effortless one-step operation.

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Brand	ORAPXI
Manufacturer	ORAPXI
Model number	LD-154
Colour	Black
Number of Memory Sticks	1
Special Feature	High Accuracy, Waterproof
Item Weight	150 g
Product Dimensions	18.3 x 0.03 x 0.03 cm; 150 g
Batteries	3 LR44 batteries required. (included)
Item model number	LD-154
Item Height	0.03 Centimeters
Item Width	0.03 Centimeters
Power Source	बटरी सचालित
Included Components	salt tester
Are batteries included?	Yes

Digital Salinity Tester for Salt Water - Waterproof IP67 Salinity Meter with ATC Large Range 0-200pp

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