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Thermistors & Thermistor Probes

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Pool & Spa temperature sensors

Designed for accuracy and durability, our pool and spa temperature sensors ensure consistent water temperature control for optimal comfort and energy efficiency. Built to withstand moisture, chemicals, and outdoor conditions, they integrate easily into a variety of heating and control systems.

Our pool & spa Sensing Solutions

We provide dependable temperature sensing solutions tailored for pool and spa systems, supporting precise control and long-term performance. Built to resist moisture, corrosion, and fluctuating conditions, our sensors help maintain comfort, safety, and system efficiency.

Thermistors

Our thermistors offer high sensitivity and fast response, making them ideal for applications requiring precise temperature monitoring. Available in a variety of resistance values, they deliver dependable performance across a wide temperature range.

Thermistor Probes

Thermistor probes combine reliable sensing elements with protective housings for easy installation and long-term durability. Designed for surface, liquid, or air temperature measurement, they perform well in both residential and commercial systems.

RTD Sensors

Known for their accuracy and stability, RTD sensors are well-suited for demanding applications that require consistent, repeatable temperature data. We offer a range of resistance values, element types, and configurations to meet diverse requirements.

RTD Probes

RTD probes are designed to provide accurate readings in tough environments, from industrial automation to HVAC systems. With rugged construction and customizable options, they offer both precision and durability where it counts.

Custom Sensors

When standard solutions aren’t enough, our custom sensors are built to meet your exact specifications. Whether it’s a unique form factor, lead configuration, or specialized material, we’ll work with you to develop a sensor that fits your application—perfectly.

Temperature Sensing Insights

A red bead is on a silver wire on a white background.

PTC Thermistors, What They Are and How They Work

By EI Sensor • July 24, 2025
Learn what PTC thermistors are, how they work, and their key applications in temperature sensing, overcurrent protection, and industrial control systems.
A bunch of different types of sensors on a table

What is a Thermistor?

By EI Sensor • July 24, 2025
Thermistors are THERMally sensitive resISTORS whose electrical resistance varies predictably with their body temperature, making them ideal tools for monitoring and controlling temperature in numerous applications including household and industrial products.
A group of three different colored electronic components on a white surface.

Types of Temperature Sensors

June 2, 2025
Temperature sensors measure and quantify temperature in materials and internal or external environments.
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Using the highest quality materials, state of the art equipment and proprietary production techniques, EI Sensor is dedicated to producing a temperature sensor that meets or exceeds our customers’ requirements. With a strong commitment to quality, continuous improvement is necessary. Our team continues to invest in research and development of new processes as well as enhancing existing processes that will result in a precise, efficient, cost effective thermistor, RTD or temperature probe assembly.