Orange Research News' (Milford, CT) 20100 Series and 20200 Series differential pressure transmitters feature +1% F.S. measurements for hvac and cleanroom applications. The 20100 Series measures dewpoint in the range of 0.20 to 400 in. The 20200 Series extends the measurement range down to 0.02 in. and includes self-calibration, output damping, and overpressure protection.