Simplify the following text for a Grade 8 native English-speaking person.
Original: Its properties were explored in detail by the British meteorologist G. M. B. Dobson , who developed a simple spectrophotometer ( the Dobsonmeter ) that could be used to measure stratospheric ozone from the ground .
Simplified: Its properties were explored in detail by the British meteorologist G. M. B. Dobson , who developed a simple spectrophotometer , the Dobsonmeter . This tool could be used to measure the ozone levels found in the stratosphere from the ground .