Notation	Name	Description	Status
1	Brewer spectrophotometer		stable
2	Caver Teichert		stable
3	Dobson		stable
4	Dobson (Japan)		stable
5	Ehmet		stable
6	Fecker telescope		stable
7	Hoelper		stable
8	Jodmeter		stable
9	Filter Ozonometer M-83		stable
10	Mast		stable
11	Oxford		stable
12	Paetzold		stable
13	Regener		stable
15	Vassy filter ozonometer		stable
16	Carbon iodide		stable
17	Surface ozone bubbler		stable
18	Filter ozonometer M-124		stable
19	ECC sonde		stable
127	Missing value		stable