Check the listing for details. DICKSON PW470 Circ Chart Recorder, 4in Dia, 24hr/7day 16A179. Condition: New. Listed at 638.66 USD. Circular Chart Recorder, Product Type Circular Chart Recorders, Recorder Height 6.25 in, Recorder Width 6 in, Recorder Depth 2.9 in, Circular Chart Diameter 4 in, Minimum Temperature Measured Degrees F -22 Degrees F, Maximum Temperature Measured Degrees F 122 Degrees F, Parameters Measured Pressure, Relative Humidity, Temperature Degrees C, Temperature Degrees F, Time Recorded 24 hr, 7 day, Accuracy Degrees F 2.0 Percent Full Scale, Maximum Relative Humidity Measured 95 Percent 4" Chart Pressure Recorders• Battery operated Dim.: 6.25"L x 6"W x 2.9"D 1/4" NPT connection, nut not requiredInstruments provide 7-day or 24-hr. pressure records for water, gas, and utility pipes. RH range: 0% to 95% noncondensing. Include pen and AA battery.Specialty Recorders.