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The HD2305.0 is a portable instruments with a large LCD display. It measures the pH and the redox potential ( ORP) in mV. It measures the temperature using Pt100 or Pt1000 immersion, penetration or contact probes. The electrode calibration can be carried out on one, two or three points at 4.01pH, 6.86pH and 9.18pH. The temperature probes are fitted with an automatic detection module, with the factory calibration settings already being memorized inside. The Max, Min and Avg function calculate the maximum, minimum or average values. Other functions include: the relative measurement REL, the Auto-HOLD function, and the automatic turning off that can also be disabled. The instruments have IP67 protection degree. INSTRUMENT TECHNICAL CHARACTERISTICS Instrument Dimensions ( Length x Width x Height) 140x88x38mm Weight 160g ( complete with batteries) Materials ABS Display 2x41D2 digits plus symbols Visible area: 52x42mm Working conditions Operating temperature -5… 50° C Warehouse temperature -25… 65° C Working relative humidity 0… 90% RH without condensation Protection degree IP67 Power Batteries 3 1.5V type AA batteries Autonomy 200 hours with 1800mAh alkaline batteries Power absorbed with instrument off 20¼ A Connections Input module for the temperature probes 8-pole male DIN45326 connector pH/ mV input Female BNC Measurement of pH by Instrument Measurement range -2.000… + 19.999pH Resolution 0.01 Accuracy ± 0.01pH± 1 digit Input impedance > 1012© Calibration error @ 25° C Offset> 20mV Slope63mV/ pH Sensitivity 106.5% Measurement of mV by Instrument Measurement range -1999.9… + 1, 999.9mV Resolution 0.1mV Accuracy ± 0.1mV Drift after 1 year 0.5mV/ year Measurement of temperature by Instrument Pt100 measurement range -200… + 650° C Pt1000 measurement range -200… + 650° C Resolution 0.1° C Accuracy ± 0.1° C Drift after 1 year 0.1° C/ year