Based on this product's specifications, here are some alternatives and similar models
Temperature sensor Sonoff SONOFF-WTS01 waterproof for SONOFF THR devices
Summary description:
Waterproof temperature sensor Sonoff SONOFF-WTS01 designed for use with Sonoff THR devices. This external probe provides temperature measurement for environmental monitoring, HVAC control, aquariums or outdoor installations where moisture protection is required. Compatible with Sonoff THR series to enable automated temperature-based switching and logging for improved device control and safety.