Due to State and Federal Law, we sell Syringes and Needles only to the Medical Facilities. 3-digit LCD display * Ultra light weight and stable * Maintenance free * Extended battery life * Easy calibration * Auto off * 2 year warranty (lasts minimum of 2 years) * Resolution: 0.1% Oxygen * Display range: 0.0 to 99.9% oxygen * Weight: 3 ounces * Response time: 90% of final value in less than 15 seconds * Accuracy and linearity: 1% of full scale constant temperature, R.H. and pressure when calibrated at full scale * Hand-held design