Does this unit have auto temp. compensation (atc)?

Yes. This unit has Auto Temperature Compensation from 0 to 50˚C

How often should I change the probe?

If damaged or isnt calibrating correctly. Unsure on longevity.

Why does the tdc function change from ppm to ppt? and, how do you read this in ppm? what does 1.25 ppt mean in ppm?

1 ppt (parts per thousand) = 1,000 ppm (parts per million). 1.25ppt would be 1250 ppm.

for weekly use, How frequently does the probe need to be replaced?

As a rule of thumb, we recommend replacing the one after one year of regular use to ensure the best accuracy.

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Description

💧 Stay ahead of the curve with the ultimate 5-in-1 water quality pro tester!

SMART CALIBRATION - Auto 1-3 point calibration with intuitive smiley icon ensures you never miss the perfect reading.
ALL IN ONE PRECISION - Measure pH, EC, TDS, Salinity & Temperature with lab-grade accuracy in one sleek device.
WATERPROOF FLOATABLE - IP67-rated rugged design means no worries if it slips into water—keeps working, keeps floating.
VIBRANT BACKLIT DISPLAY - Large dual-display LCD with 3-color backlight for instant mode recognition and stable reading alerts.
COMPLETE READY TO GO KIT - Includes calibration & storage solutions, batteries, lanyard, and portable case—professional testing anywhere.

The Apera Instruments AI316 PC60 is a professional-grade, pocket-sized multi-parameter tester that delivers fast, accurate measurements of pH, conductivity (EC), total dissolved solids (TDS), salinity, and temperature. Featuring a replaceable probe, smart auto-calibration, and a large backlit LCD, it’s IP67 waterproof and floats if dropped in water. Powered by AAA batteries with up to 1000 hours runtime, it comes as a complete kit with calibration solutions and a carrying case—ideal for hydroponics, aquaculture, environmental monitoring, and more.

Specifications

ASIN	B01ENFOIKA
Batteries	4 AAA batteries required. (included)
Best Sellers Rank	#28,569 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #8 in Lab Multiparameter Meters
Date First Available	April 22, 2016
Is Discontinued By Manufacturer	No
Item Weight	4.7 ounces
Item model number	AI316
Manufacturer	Apera Instruments
Product Dimensions	7 x 1.6 x 1.6 inches

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AI316 Premium Series PC60 5-in-1 Waterproof pH/EC (Conductivity) /TDS (ppm) /Salinity (ppt) /Temp. Multi-Parameter Pocket Tester Kit

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Specifications

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