There is an inexpensive device MLX90614 (Datasheet PDF) – Infra Red Thermometer in TO-39. It’s intended to measure the temperature ranging from -20°C to +120°C. Measurement accuracy is ~ 0.5°C. Bus connection: SMBus. Price sensor on AliExpress or other online stores is $ 15-20.
In this article, I will use the current monitor based on the ZXCT series IC for measuring current voltage and watts.