every month
everytime that it is turned on
Every 4 Years Every 4 Years
five years
We recommend every 30,000 miles.
Mercury is most often found in thermometers.
An instrument for measuring temperature, often a sealed glass tube that contains a column of liquid, as mercury, that expands and contracts, or rises and falls, with temperature changes, the temperature being read where the top of the column coincides with a calibrated scale marked on the tube or its frame. Source~ dictionary.refrence.com
Jet engines are not calibrated as such but get routine maintainance depending on the flying hours of the engine. They also undergo major overhaul and preformance runs during their life. But i think calibrate is the wrong term.
Thermometers are the instrument that is often filled with mercury, colored water, or alcohol. Most early thermometers were made with mercury.
The original plugs should be good for around 100,000 miles ( 160,000 ) kms. Take it from there.
Mercury
Both Sulfur (S) and Mercury (Hg) are elements. However, Mercury has a great affinity for Sulfur, and is often found in Mercury Sulfides. Cinnabar (Mercury Sulfide, HgS) is a common Mercury Ore.
mercury