Range Autoranging 0.030-1.999 ppm and 2.0-20.00 ppm Accuracy 10% accuracy. Temperature and Relative Humidity Compensated Resolution 0.001 PPM Response time Less than 60 seconds Sensor type The replaceable SM-X board contains a HMOS (heated metal oxide semiconductor) sensor having a life of 2-3 yrs. depending on its placed environment and usage Display Back light for LCD display Outputs 4-20mA Data Logging Instant readout of high, low and average ozone level on LCD screen. Data port for external data logger such as our DL-2. USB, 4-20 mA, 0-2 VDC outputs for loggers, computers and PLC. Temperature range 32-104 F (0-40 degrees C) Humidity range 0-80% Battery 12 hour (est) battery life. 8 hour charge. 4 hour fast charge available Power requirements Internal rechargeable batteries or 12-24 VDC, 500 mA, from included external adapter/charger Size 4.25 x 8.25 x 2.5 in (WxLxD) 10.795 x 20.955 x 6.35-cm Weight 2-lbs (0.9 kg) Supporting documents User manual and NIST Traceable Calibration sheet included Warranty 1 yr Data Cable Includes a data cable for the 0-2 VDC and 4-20mA output. Case Rugged durable case with Tilt stand and wall hanging hook