HiLetgo 5pcs DS18B20 Temperature Sensor Temperature Probe Stainless Steel Package Waterproof 1M

Works as advertised. Based on Dallas DS18B20 chip, no voltage conversion necessary. Look in the arduino libraries for advanced uses

Excelente calidad

These work as expected. There is some slight variance between them, so I calibrate them (with a straight-line approximation in software) with ice- and boiling-water baths to dial them in.

جيد لكن يحتاج لمقاومة

I purchased these for monitoring the temperature in my machine room and server racks. Inexpensive, easy to wire up to a USB-to-TTS dongle, Arduino, or Raspberry Pi. They work well with the DallasTemperature "OneWire" library and with the linux "digitemp" program (apt install digitemp). For accuracy, I suspended the sensor in the air, waited 30 minutes, and compared their measurements against two different physical thermometers. Each of the five digital thermometers were within 2 degrees F (1 degree C) of the physical thermometers, and all of these thermometers matched each other to within 0.5F. That's accurate enough for my own needs. (Especially since I have no direct way to measure the accuracy of the physical thermometers. For all I know, these may be more accurate.)