What is the best way to check the accuracy of my unit?

what is the best way to check the rainfall and temperature accuracy of my unit?

rainfall - buy a CoCoRAHS manual gauge to compare with

temperature+humidity - buy a reference gauge (ecowitt is inexpensive) or build yourself a little arduino or pi or pi pico breadboard rig with sensors to compare with. Note that all sensors need to be tested versus each other to know ‘they’ are accurate.

Buying officially calibrated temperature/humidity sensors is ‘really’ expensive.

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