---
product_id: 239135376
title: "6521 Temperature and Voltage Sensor, Long"
brand: "traxxas"
price: "€ 57.02"
currency: EUR
in_stock: true
reviews_count: 5
category: "Traxxas"
url: https://www.desertcart.fi/products/239135376-6521-temperature-and-voltage-sensor-long
store_origin: FI
region: Finland
---

# Voltage range 0-12V DC Long sensor with mounting screw Temp range -20°C to 80°C 6521 Temperature and Voltage Sensor, Long

**Brand:** traxxas
**Price:** € 57.02
**Availability:** ✅ In Stock

## Summary

> 🌟 Stay ahead of the pack with real-time power and temp telemetry!

## Quick Answers

- **What is this?** 6521 Temperature and Voltage Sensor, Long by traxxas
- **How much does it cost?** € 57.02 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/239135376-6521-temperature-and-voltage-sensor-long)

## Best For

- traxxas enthusiasts

## Why This Product

- Trusted traxxas brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Plug-and-Play Replacement:** Effortlessly swap worn sensors without complicated mods or soldering.
- • **Durable Long Sensor Design:** Extended cable length with secure mounting screw for perfect fit and easy installation.
- • **Optimized for Heavy-Duty Use:** Ideal for rock crawling and 3S LiPo setups to avoid unexpected power drops.
- • **Seamless Traxxas Link Integration:** Real-time telemetry directly on your Traxxas Link app for instant insights.
- • **Precision Temperature & Voltage Monitoring:** Keep your Traxxas rig cool and powered with ±1.5% accuracy readings.

## Overview

The Traxxas 6521 Temperature and Voltage Sensor (Long) is a precision telemetry accessory designed for Traxxas RTR vehicles. It accurately measures battery voltage (0-12V) and temperature (-20°C to 80°C) with ±1.5% accuracy, transmitting data seamlessly via the Traxxas Link system. Featuring a long sensor cable with mounting screw, it ensures easy installation and reliable performance during heavy-duty rock crawling or trail use. This sensor is a direct replacement part, crafted from durable metal and plastic, engineered to keep your Traxxas rig running optimally and prevent power or thermal surprises.

## Description

Sensor, temperature and voltage (long) Use Traxxas stock and hop-up replacement parts to get the most out of your Traxxas RTR vehicles. This product is made from high quality materials and designed for long-lasting performance. This is replacement hardware for use on Traxxas vehicles; consult your user's manual for exact parts listings.

Review: Must have for Temp/Voltage telemetry for TRX4 crawlers - I am using this in my TRX4 G-500 crawler. I think the temperature is very useful for heavy duty trailing or rock crawling, especially using 3s batteries. The voltage telemetry is an absolute necessity when you are using LiPo; especially when using the rig in such a way that the low-voltage feature of the Traxxas ESC may not be immediately obvious. The temperature probe installation is very easy - simply zip tie the flatter sensor part of the black hooped wire directly to the motor (any motor, Traxxas or otherwise). The readings are quick to transmit and seem accurate thus far. The wire length is just about perfect for the TRX4 chassis, with enough slack to route as desired, but not so much that you have to be creative zip tying the excess wire. The voltage installation will take some basic knowledge in electronics. Traxxas saw fit to fit the voltage wire with a JR male plug with a single wire to be attached to the positive power source. Using the Traxxas battery adapter is not possible without modification of the TRX4 ESC battery connector (which I am unwilling to do on a new rig). Many folks simply solder the red wire to the positive terminal of the ESC connector, and this is fine. However I prefer a plug/unplug option that doesn't require modification or soldering of the TRX4's connection. Because the xl-5 hv ESC comes with a full-voltage takeoff that runs straight to the battery (as confirmed by multimeter measurements using 3 different batteries), I decided to use that as my source for telemetry. However, the takeoff uses a JST male connector. So I simply built a JST female to JR female connector by soldering 2 red 20AWG wires attached to the respective terminals. I completely removed the black wire and the terminals originally attached to the stock connectors. I made the length long enough to feed under the battery tray, but not be too slack. Before attaching to the telemetry connector, I ensured perfect continuity from the red ESC battery connector to the final plug. Out of curiosity I plugged the telemetry unit and checked its continuity, and found that a 9.05Ohm resistor is wired into the unit. That same resistance was present without anything plugged into the telemetry cable... which explains how it works in the receiver box. The later model TRX4s (including the G-500) have BEC voltage going to the receiver. As a result, the telemetry picks up on this steady voltage and reports it to the transmitter *even when the voltage telemetry wire is not connected to the battery*. I would *not* trust this for good battery voltage reporting as it will mask the actual voltage coming from the battery. When I plugged the battery to the telemetry terminal, I could tell I was obtaining real-time voltage -- prior to connection, there was no momentary drop of voltage when I quickly throttled up the motor; post connection, the telemetry showed the momentary voltage dip one would expect from a quick throttle up. Getting the telemetry unit to fit in the receiver box was a bit tedious, but not hard really. I do wish there was perhaps 2-4mm of red wire to make it a little easier. So, save the money on the half-useless Traxxas adapter, buy some bulk connectors with cables and solder your own JR female - JST female adapter. $3 for the temperature mount is silly in my opinion since I connected mine with a zip tie for effectively less than 10 cents.
Review: Traxxas forever - Rien a dire traxxas. Simple a brancher et simple utiliser

## Features

- Functions with the Traxxas Link system to display battery voltage and temperature
- Long Temperature and Voltage Sensor with Mounting Screw
- Replacement for worn or damaged sensor

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B006IRXF6U |
| Brand | Traxxas |
| Brand Name | Traxxas |
| Country of Origin | USA |
| Customer Reviews | 4.6 out of 5 stars 528 Reviews |
| Global Trade Identification Number | 00020334652102 |
| Item Dimensions | 8 x 0.3 x 13.3 Centimeters |
| Item Weight | 0.01 Ounces |
| Item dimensions L x W x H | 8 x 0.3 x 13.3 Centimeters |
| Manufacturer | HRPA - Traxxas |
| Material | Metal, Plastic |
| Material Type | Metal, Plastic |
| Maximum Supply Voltage | 3 Volts (DC) |
| Measurement Accuracy | ±1.5% |
| Measuring Range | Temperature: -20°C - 80°C, Voltage: 0 - 12V |
| Model Number | TRAM6521 |
| Mounting Type | Surface Mount |
| Output Type | electrical signal |
| Part Number | 6521 |
| Specific Uses For Product | Temperature |
| Style | Temperature Sensor |
| Style Name | Temperature Sensor |
| UPC | 783329517762 020334652102 885694932598 885932123412 754295192581 696748268453 |
| Unit Count | 1.0 Count |
| Upper Temperature Rating | 150 Degrees Celsius |
| Warranty Description | No Warranty |

## Product Details

- **Brand:** Traxxas
- **Item Weight:** 0.01 Ounces
- **Item dimensions L x W x H:** 8 x 0.3 x 13.3 Centimeters
- **Material:** Metal, Plastic
- **Style:** Temperature Sensor

## Images

![6521 Temperature and Voltage Sensor, Long - Image 1](https://m.media-amazon.com/images/I/61Lyq548nmL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Must have for Temp/Voltage telemetry for TRX4 crawlers
*by L***E on 16 June 2020*

I am using this in my TRX4 G-500 crawler. I think the temperature is very useful for heavy duty trailing or rock crawling, especially using 3s batteries. The voltage telemetry is an absolute necessity when you are using LiPo; especially when using the rig in such a way that the low-voltage feature of the Traxxas ESC may not be immediately obvious. The temperature probe installation is very easy - simply zip tie the flatter sensor part of the black hooped wire directly to the motor (any motor, Traxxas or otherwise). The readings are quick to transmit and seem accurate thus far. The wire length is just about perfect for the TRX4 chassis, with enough slack to route as desired, but not so much that you have to be creative zip tying the excess wire. The voltage installation will take some basic knowledge in electronics. Traxxas saw fit to fit the voltage wire with a JR male plug with a single wire to be attached to the positive power source. Using the Traxxas battery adapter is not possible without modification of the TRX4 ESC battery connector (which I am unwilling to do on a new rig). Many folks simply solder the red wire to the positive terminal of the ESC connector, and this is fine. However I prefer a plug/unplug option that doesn't require modification or soldering of the TRX4's connection. Because the xl-5 hv ESC comes with a full-voltage takeoff that runs straight to the battery (as confirmed by multimeter measurements using 3 different batteries), I decided to use that as my source for telemetry. However, the takeoff uses a JST male connector. So I simply built a JST female to JR female connector by soldering 2 red 20AWG wires attached to the respective terminals. I completely removed the black wire and the terminals originally attached to the stock connectors. I made the length long enough to feed under the battery tray, but not be too slack. Before attaching to the telemetry connector, I ensured perfect continuity from the red ESC battery connector to the final plug. Out of curiosity I plugged the telemetry unit and checked its continuity, and found that a 9.05Ohm resistor is wired into the unit. That same resistance was present without anything plugged into the telemetry cable... which explains how it works in the receiver box. The later model TRX4s (including the G-500) have BEC voltage going to the receiver. As a result, the telemetry picks up on this steady voltage and reports it to the transmitter *even when the voltage telemetry wire is not connected to the battery*. I would *not* trust this for good battery voltage reporting as it will mask the actual voltage coming from the battery. When I plugged the battery to the telemetry terminal, I could tell I was obtaining real-time voltage -- prior to connection, there was no momentary drop of voltage when I quickly throttled up the motor; post connection, the telemetry showed the momentary voltage dip one would expect from a quick throttle up. Getting the telemetry unit to fit in the receiver box was a bit tedious, but not hard really. I do wish there was perhaps 2-4mm of red wire to make it a little easier. So, save the money on the half-useless Traxxas adapter, buy some bulk connectors with cables and solder your own JR female - JST female adapter. $3 for the temperature mount is silly in my opinion since I connected mine with a zip tie for effectively less than 10 cents.

### ⭐⭐⭐⭐⭐ Traxxas forever
*by E***N on 1 June 2026*

Rien a dire traxxas. Simple a brancher et simple utiliser

### ⭐⭐⭐⭐⭐ Super
*by I***M on 26 May 2026*

This is traxxas the best in the world

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**Shop now:** [https://www.desertcart.fi/products/239135376-6521-temperature-and-voltage-sensor-long](https://www.desertcart.fi/products/239135376-6521-temperature-and-voltage-sensor-long)

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-08-28*