This is paragraph text. Click it or hit the Manage Text button to change the font, color, size, format, and more. To set up site-wide paragraph and title styles, go to Site Theme.

This is paragraph text. Click it or hit the Manage Text button to change the font, color, size, format, and more. To set up site-wide paragraph and title styles, go to Site Theme.

This is paragraph text. Click it or hit the Manage Text button to change the font, color, size, format, and more. To set up site-wide paragraph and title styles, go to Site Theme.

Pool & Spa temperature sensors

Designed for accuracy and durability, our pool and spa temperature sensors ensure consistent water temperature control, providing optimal comfort and energy efficiency for your aquatic environments. These sensors are built to withstand the challenges posed by moisture, chemicals, and outdoor conditions, making them a reliable choice for any setting.


With easy integration into a variety of heating and control systems, our sensors are perfect for enhancing your pool or spa experience. Explore the advantages of efficient temperature management and elevate your water quality today.

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

Hand connecting wires to an outdoor electrical junction box on a stone wall

How Thermistors Help Prevent Thermal Runaway

By Teri Wilfong • October 28, 2026
Learn how thermistors help prevent thermal runaway through early temperature detection, reliable monitoring, and overheat protection in batteries and electronic systems.
Hand holding a digital pressure gauge reading 31.4 BAR in an industrial control panel area

Managing Thermal Lag in Fast-Response Applications

October 21, 2026
Learn how to reduce thermal lag in fast-response temperature sensing with insights on sensor design, probe materials, placement, and custom thermistor and RTD solutions.
Hands holding an orange handheld instrument with a keypad and screen in a lab setting

What is a Thermocouple?

September 21, 2026
Learn what a thermocouple is, how it works, common thermocouple types, applications, and how thermocouples compare to thermistors and RTDs.

partner with ei sensor

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.