3-Digit LCD Display; Resolution: 0.1% Oxygen; Warm-up time: None; Operating Temperature: 60 - 104 degree F (15 - 40 degreee C); Display Range: 0.0 - 99.9% Oxygen; Response Time: 90% of final value < 15 seconds @ 770 F (25 C); Accuracy & Linearity: 1% of full scale constant temperature, R.H and pressure when calibrated at full scale