DS18B20, the waterproof temperature sensor that you're looking for

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One Wire Waterproof Temperature Sensor DS18B20

Waterproof DS18B20-Compatible Temperature Sensor with Resistor

DS18B20 Stainless steel package 1 meter waterproof temperature

DS18B20 Waterproof Digital Temperature sensor with 1m cable 1-wire

DS18B20 Waterproof Temperature Sensor

DS18B20 Waterproof Digital Temperature Sensor Kit - RobotShop

One Wire Digital Temperature Sensor DS18B20 Waterproof [DS18B20

1PCS DS18B20 Stainless steel package Waterproof DS18b20