On May 27, 2020, the elevation measurement of Mount Everest was completed, marking the seventh large-scale measurement of Mount Everest in China. But for the exploration of Mount Everest, humans have not stopped for a moment. Looking up at this highest peak on Earth, surveyors constantly refresh the height given to it.

On May 27th at 11:00 am Beijing time, the 2020 Everest elevation measurement team successfully reached the summit of Mount Everest, completing China's seventh large-scale measurement of Mount Everest. From 1966 to 2005, China conducted large-scale measurements of Mount Everest six times, and two sets of precise data in 1975 and 2005 were recognized by authoritative organizations including UNESCO. Reviewing the six measurements of Mount Everest also witnessed China's tremendous leap in the field

Direct leveling is measured through a level and a leveling rod. During the measurement process, attention should be paid to maintaining the accuracy of the level and eliminating errors, such as refraction errors, line of sight errors, etc. Indirect leveling is a method of calculating elevation by measuring the length and angle of height differences. Commonly used indirect leveling methods include triangular elevation measurement, elevation difference calculation, gravity leveling, etc.

Indium steel ruler, also known as indium tile ruler, indium tile leveling ruler, etc. Indium steel ruler is a common member of the leveling ruler family in the field of surveying and monitoring. It can be said that indium steel ruler is a royal family in the leveling ruler kingdom. There are three famous leveling rulers, one is an indium steel ruler, the other is a double-sided ruler, and the third is a tower ruler.