The following pagargraph is from the Wikipedia page of calomel:
Mercurous chloride is employed extensively in electrochemistry, taking advantage of the ease of its oxidation and reduction reactions. [...] Over the past 50 years, it has been superseded by the silver/silver chloride (Ag/AgCl) electrode. Although the mercury electrodes have been widely abandoned due to the dangerous nature of mercury, many chemists believe they are still more accurate and are not dangerous as long as they are handled properly.
Yes, the calomel electrode is a breakthrough in electrochemical industry due to its ease of its oxidation and reduction reactions. But, the nature of mercury is such that every chemist fears it. There has been cases of mercury poisoning and deaths related to it. Despite its toxicity, electrochemist prefer the SCE over the silver/silver cloride electrode. Why?
Due to its toxicity, the SCE has almost been replaced by the silver/silver chloride electrode. But still, the SCE is used as a reference electrode. Why? Why is the silver/silver chloride electrode not as good as the SCE?
Also, what are the safety measures/protocols undertaken by electrochemists while performing experiments using the calomel electrode?