Specifications include, but are not limited to: One (1) UV Photometric Ozone Calibrator, Teledyne API Model T703 or equivalent. The unit must be suitable for use as a primary or transfer standard for calibration of ozone analyzers and be able to deliver ozone concentrations from 50 ppb to 5 ppm and adjustable flow rates from 1 LPM to 5 LPM. The following specifications must be met; • Range 100 ppb – 10,000 ppm • Lower detectable limit .6 ppb RMS • Zero noise level 0.3 ppb RMS • Precision = 1 ppb • Linearity must be 1% of reading • Rise and fall time of 20 seconds or less to 95% • Zero drift <1 ppb/7 days, span drift < 1%/day, <2%/7 days • Operating temperature range covering at least 5°C to 40°C • DC output range 0 to 1 volt • The calibrators must be capable performing at least 40 independent calibration sequences that can be actuated manually, automatically or by a remote signal and must operate on an input voltage of 115 VAC 60 Hz