New research shows thermometers measuring global warming are calibrated correctly.

Instrumental temperature record - Wikipedia

Uncertainty in Global Temperature Assessments

Difference between readings taken with a spirit-in glass thermometer

Which is a more reliable measure of global temperature: thermometers or satellites?

Calibrating Thermometers: The Science Behind Meaningful Temperature Measurement, Part 1: Introduction

Explainer: How data adjustments affect global temperature records - Carbon Brief

Energies, Free Full-Text

Climate, Free Full-Text

Climate, Free Full-Text

Taking the planet's temperature: How are global temperatures calculated? - Climate & Environment at Imperial

How do scientists measure global temperatures? - Quora

All About Calibration Process I How to Calibrate Thermometer?

MeCCO Monthly Summaries :: Media and Climate Change Observatory