Waterproof NTC 50K Thermistor Temperature Sensor Probe Wire

Meet your next go-to component for precise, reliable temperature measurement — the Waterproof NTC 50K (B: 3950) Thermistor Temperature Sensor Wire Probe. Designed for engineers, hobbyists, and makers alike, this compact sensor delivers accurate, stable readings in a range of environments. Available in 2 color options and three cable lengths (13 cm, 40 cm, and 100 cm), it's easy to integrate into your project exactly the way you need it.

Key Features

• NTC 50K Thermistor (B: 3950): Delivers high-accuracy temperature sensing with a negative temperature coefficient — resistance decreases as temperature rises, giving you a consistent, predictable signal.
• Waterproof Construction: The sealed probe head shrugs off moisture, splashes, and condensation, making it suitable for both indoor and outdoor applications.
• Fixed Mounting Hole: The integrated mounting hole allows for secure, permanent installation in enclosures, appliances, or custom rigs without additional hardware.
• Flexible Cable Lengths: Choose from 13 cm, 40 cm, or 100 cm wire lengths to suit your wiring layout — no awkward cutting or splicing required.
• Wide Application Range: Perfect for home appliances, aquarium controllers, 3D printer heated beds, HVAC systems, constant-temperature equipment, and DIY electronics projects.
• Plug-and-Play Ready: No additional calibration needed out of the box — just connect and start reading.

Specifications

• Type: NTC Thermistor
• Resistance: 50K Ω at 25°C
• B Value: 3950 K
• Cable Lengths: 13 cm / 40 cm / 100 cm
• Color Options: 2 available
• Waterproof: Yes (sealed probe)
• Mounting: Fixed mounting hole included

Ideal For

• Home appliance temperature control systems
• 3D printer heated bed monitoring
• Aquarium and terrarium temperature management
• HVAC and constant-temperature systems
• DIY electronics and Arduino/Raspberry Pi projects
• Industrial and laboratory measurement setups

Whether it's a component upgrade for a professional build or a handy addition to your maker toolkit, this thermistor sensor delivers consistent performance you can count on.

For further reading on thermistor-based temperature sensing and electronic measurement standards, visit the National Institute of Standards and Technology (NIST) – Thermometry.

Frequently Asked Questions

Q: What does NTC 50K B 3950 mean on a thermistor temperature sensor?

A: NTC stands for Negative Temperature Coefficient, meaning the sensor's resistance decreases as temperature increases. "50K" refers to its resistance value of 50,000 ohms (50 kΩ) at 25°C, and "B 3950" is the B-constant (or beta value) that describes the relationship between resistance and temperature — a critical parameter for accurate temperature calculations in your circuit.

Q: Is this waterproof thermistor sensor suitable for use in aquariums or wet environments?

A: Yes. The probe head is fully sealed and waterproof, making it suitable for humid or wet environments such as aquariums, condensation-prone enclosures, or outdoor installations. Always ensure the cable connections are properly insulated for fully submerged applications.

Q: Which cable length should I choose — 13 cm, 40 cm, or 100 cm?

A: Choose based on the distance between your sensor mounting point and your controller board or terminal. For compact enclosures or nearby components, 13 cm works well. The 40 cm option suits mid-range setups such as 3D printers or appliance interiors. The 100 cm cable is ideal for longer runs, wall-mounted panels, or large equipment where the sensor is far from the control unit.

Q: Can I use this thermistor with an Arduino or Raspberry Pi?

A: Absolutely. This NTC 50K B 3950 thermistor is a popular choice for microcontroller projects. Simply connect it in a voltage divider circuit with a known resistor, read the analog voltage output, and apply the Steinhart-Hart equation (or a simplified B-parameter formula) to calculate the temperature. Many open-source libraries support NTC thermistors directly.