Below are the technical specifications for the Twin Scale Peak Flow Meter where the EU scale and Wright-McKerrow scale are side by side.
| Size | 100x60x240 mm |
| Weight | 125 grams |
| Measurement Range | 20-880 l/min (EU scale) 60-800 (Wright-McKerrow Scale) |
| Accuracy | +/- 10% or 10 L/min |
| Repeatability | < 5 l/min |
