Photo shows medium pneumotach with optional R3850 heater control.
R8420/21 Specifications Guinea Pig Size)
0-5 L/min (0 - .083 L/sec) Calibrated Flow Range
Dead space: 0.71 ml
Weight: 28.2 gram
Length: 50 mm
Ports: 15mm OD and 22.2mm (0.875") OD (.875 fits ET tube connector)
Fleisch equivalent: # 000
R8430/31 Specifications (Mouse Size)
0-3 L/min (0 - .05 L/sec) Calibrated Flow Range
Last Updated: 16 Jan 2016