When you need to measure temperature, the DS18B20 is a firm favourite. Easy to code and with an abundance of examples on the internet, it's a go-to temperature sensor! This particular sensor is a pre-wired, waterproof version with a DS18B20-compatible sensor in the tip - great for measuring the temperature of liquids, or simply something further away from your microcontroller. These are a digital sensor, so you don't have to worry about signal issues over longer distances. Now available in ~1m and ~3m lengths. As the coating/exterior is made of PVC, we suggest limiting the submerged liquid temperature to 100°C to stay on the safe side. Don't use it in salt water or other corrosive liquids. Not IP rated or guaranteed for long-term/high-pressure usage. These sensors are quite precise (±0.5°C usually and can give up to 12 bits of precision from the onboard digital-to-analogue converter. They use the Dallas 1-Wire protocol, so data is transferred over a single IO pin, and they're suitable with 3-5V systems. Want something simpler than 1-wire? Maybe try the TMP36 instead. A 4.7K resistor is included to use as a pull-up for fitting between the VCC and data pin. We toss in a 4.7k resistor, which is required as a pull-up from the DATA to VCC line. For Arduino-compatible devices, you can get started using the Dallas Temperature Control Arduino library which also requires the OneWire Library. Specifications * Stainless steel tube 6mm diameter by 30mm long * Cable length (select before adding to cart): * ~1m (sometimes as short as 90cm depending on the batch) * ~3m * Contains DS18B20-compatible temperature sensor * Red connects to 3-5V, White/Blue/Black (varies by batch) connects to ground and Yellow/White (varies by batch) is data. DS18B20 Specifications * Sensor temperature range: -55 to 125°C (but please stick to under 100°C due to the PVC coating!) * 9 to 12-bit selectable resolution * Uses 1-Wire interface- requires only one digital pin for communication * ±0.5°C Accuracy from -10°C to +85°C * Temperature-limit alarm system * Query time is less than 750ms * Usable with 3.0V to 5.5V power/data Resources * Maxim DS18B20 Datasheet (a good reference for these compatible versions) * Regulate Temperature with a Raspberry Pi Pico (thanks to Paulo for the link and excellent project) https://elecena.pl/product/22713225/waterproof-ds18b20-compatible-temperature-sensor-with-resistor 2023-03-06 https://elecena.pl/product/22713225/waterproof-ds18b20-compatible-temperature-sensor-with-resistor 2023-12-27 https://elecena.pl/product/22713225/waterproof-ds18b20-compatible-temperature-sensor-with-resistor 2024-09-19 https://elecena.pl/product/22713225/waterproof-ds18b20-compatible-temperature-sensor-with-resistor 2024-11-29 https://elecena.pl/product/22713225/waterproof-ds18b20-compatible-temperature-sensor-with-resistor 2024-11-30 https://elecena.pl/product/22713225/waterproof-ds18b20-compatible-temperature-sensor-with-resistor 2025-11-28 https://elecena.pl/product/22713225/waterproof-ds18b20-compatible-temperature-sensor-with-resistor 2025-11-29