Will this work on salt (ocean) water (not continuously submerged)?

Depends on the tds level of the water. This meter only goes up to 1000 ppm. If the water is higher than that it won’t read it correctly

Can this be left submerged permanently?

If you talk about the sensor itself, I would say yes. Depends a bit on the salinity of the fluid you are measuring. Sea water will destroy everything given enough time. Potable water should be OK.

Can i use this sensor an esp32 board? the example code is for arduino uno

Yes it works just fine with an ESP 32. the example code works as well for the esp 32

Does this come with any calibration solutions or what is recommended for calibration?

it does not. Also, it only reads up to 1000ppm, so its ok for water quality testing, but not hydroponics nutrient solution. you can buy calibration solution on amazon

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KEYESTUDIO TDS Meter Probe Water Quality Monitoring V1 Sensor Module with XH2.54-3Pin Jumper Wire Connector for Arduino

Product ID: 516537837

⚡Wide Voltage Range

💧TDS Measurement

🔌Plug & Play

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NZ$57

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Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💡 Dive into Clean Water with Confidence!

EASY INTEGRATION - Seamlessly connects with Arduino for DIY projects.
USER FRIENDLY SETUP - Plug and play design for instant use.
MEASURE WATER PURITY - Accurately gauge TDS levels for cleaner water.
COMPREHENSIVE SUPPORT - Access online tutorials for effortless setup.
VERSATILE APPLICATIONS - Perfect for hydroponics and domestic water testing.

The KEYESTUDIOTDS Meter Probe is a cutting-edge sensor module designed for Arduino enthusiasts, enabling precise measurement of Total Dissolved Solids (TDS) in water. With a user-friendly plug-and-play setup, it operates within a wide voltage range of 3.3 to 5.5V and provides an analog output of 0 to 2.3V. Ideal for both hydroponics and domestic water quality testing, this sensor empowers users to ensure cleaner water effortlessly.

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