An NTC thermistor is designed to measure temperature changes in different applications, but it is truly ideal for working in liquids (such as water). This is a result of long-term reliability and stability. They are the most accurate temperature gauges (when compared to a thermocouple), which allows for extremely close readings.
A thermistor placed in water will most likely stay in one place for extended periods of time. A thermistor offers long-term durability for thermistor in water-based applications. A thermocouple will begin to weaken, which degrades its ability to read temperature accurately. Having to consistently replace thermocouples will intermittently stop production.
A study about water temperature changes in Lake Tahoe has just recently ended. It was a 40-year study that suggests global warming is responsible for an increase in temperature in the lake (there has been a consistent rise over the last four decades). This is a big problem for the current habitat of the lake, and the warmer water threatens to destroy the whole eco-system.
NTC thermistors were extensively used for this study because of their high accuracy rates. The thermistors helped to prove that the temperature of the water, on average, has risen 0.61 degrees Fahrenheit. This increase has been tracked for the last twenty-five years.
When it comes to measuring temperature in liquids like water, thermistors should come to mind first.
Microedge has three models of thermistor data loggers can be used for this purpose. iTH-10 is a low-cost thermistor logger with one on-board thermistor channel plus one external thermistor channel. LPTH-1 has seven exteranl thermistor channels plus one on-board thermistor channel. PL-HW can record eight exteranl thermistor channels and its WIFI feature makes it easy to download data from remote field.