Automatic timing of oxygen flow as low as .25 L/min. Unit is easily reset to zero with tip of pen or pencil. Extremely accurate time measurement with time increments of 0.1 hours. Large easy to read time display. Up to 1999.9 recorded hours of oxygen flow. Compact, lightweight and durable design. Field-serviceable battery with an expected life of five years. Two-year warranty on unit excluding battery.
