Quantity   Component name
1 × Sensorex pH1000 pH Probe After trying several pH probes, this one seems to be a good quality probe at a reasonable price
1 × Very reasonably priced EC probe with 10K thermistor I had been playing around with making my own EC probe, but after finding this one, it really does not make sense to build your own. It is a probe for the CM-230 EC meter and is around $20 from several sources on Aliexpress. I ordered it from https://www.aliexpress.com/item/1-00-Plastic-conductivity-electrode-CM230-electrode-5m-pin-plug-for-CM-230-Conductivity-Meter/32679762847.html and received it in about 2 weeks.