High-quality waterproof temperature sensor can be used to measure both air and liquid temperatures. It can operate in two modes.  One  mode sends alerts when temperature goes above or below your thresholds. And the second mode allows you to send data to a ThingSpeak channel for display and analysis. See here for directions on how to setup this free data channel.  

Temperature Alert comes with an extra long flat 6 ft power cord. Its high quality  temperature sensor has a temperature range from -55°C to +125°C (-67°F to +257°F), with accuracy of 0.5°C over recommended range of -10°C to +85°C. All readings outside this range are ignored: -30°C to +105°C or -22°F to +221°F

Multiple (up to 5) email addresses can be added to receive temperature alerts.  All or some of them can be used  to receive text notifications. See General FAQ  for details.

Internet detection service sends multiple status updates to MySpool cloud service per minute.  If two or more are missed, the service sends Internet OFF alert. It usually takes 1-3 minutes for this alert to be generated and delivered.  Once internet connectivity is restored, an Internet ON alert is sent.

Both Intenet ON and Internet OFF notifications are configured independently; both can be disabled if desired. All MySpool notification and monitoring services are free

View device status and recent activity on a dedicated secure web page. Temperature high and low alerts and Internet ON and OFF alerts as well as the temperature chart are displayed 

Email messages are limited to one per minute per sensor.

All MySpool services are free.