Open Hardware Monitor - Core temp, fan speed and voltages in a free software gadget
Amazon.com: Smart WiFi Temperature Humidity Monitor: TUYA Wireless Temperature Humidity Sensor with APP Notification Alerts, WiFi Thermometer Hygrometer for Home Pet Garage,Compatible with Alexa : Patio, Lawn & Garden
Trakkit THS - WiFi Temperature & Humidity Sensor
Amazon.com: Temp Stick Remote WiFi Temperature & Humidity Sensor. No Subscription. 24/7 Monitor, Unlimited Text, Push & Email Alerts. Free Apps, Made in America. Use with Alexa, IFTTT. Monitor Anywhere, Anytime. :
Nest Temperature Sensor - Google Store
ThermoPro TP50 Indoor Thermometer Humidity Monitor Weather Station with Temperature Gauge Humidity Meter Hygrometer - Walmart.com