Silvercrest SPO 55 Instructions For Use And Safety Notes page 79

Altitudes Expected SpO₂ value
(oxygen saturation) in %
1500–2500 m > 90
2500–3000 m ~ 90
Source: Hackett PH, Roach RC: High-Altitude Medicine. In: Auerbach PS (ed):
Wilderness Medicine, 3rd edition; Mosby, St. Louis, MO 1995; 1-37.
Affects on people
No anoxia (typically)
Anoxia, acclimatisation recommended
GB/IE 79