Based on this product's specifications, here are some alternatives and similar models
Soil moisture sensor Sonoff SONOFF-MS01 for smart controllers THR16 THR320 — probe sensor for soil moisture monitoring
Summary description:
The Sonoff SONOFF-MS01 is a soil moisture probe designed to work with Sonoff smart controllers THR16 and THR320. It provides direct moisture sensing in soil or substrate to automate irrigation or monitor plant conditions. The sensor connects to compatible controllers to trigger relays based on moisture thresholds, helping maintain optimal watering and reduce manual checks.