I have a conductivity kit from Atlas Scientific, but the ezo conductivity module is missing. I just connected the sensor probe to pin A0 on the Arduino Uno with the analogRead command in the source code. However, I'm still confused about the sensor output. Can I convert sensor output to microsiemens/cm? If so, what is the source code?

 

Welcome to AAC.

From the datasheet for the EC EZO it appears to so a lot of heavy lifting. Depending on the accuracy and repeatability you require, you might be able to use the probe with one of the several Arduino conductivity meter projects you can easily find searching for "arduino conductivity probe".

It doesn't appear you are very likely to find something that reproduces the functionality of the EC EZO which inlcludes calibration and temperature compensation for example. The probe itself is entirely passive. It's just a carefully packaged pair of wires with know length and spacing.

It depends entirely on the device reading its output for accurate and consistent measurement. It might just be best to buy the board which is easily interfaced to an MCU with I²C or UART if that's what you want to do.