Model DSP-RmFeatures :Mains rechargeable operationOverall range -110 C to +20 C dewpointUser Friendly - Simple OperationPortable - Fully Self ContainedSelf-Diagnostics on Start-upDigital IndicationAutomatic Switch OffQuick Connect SS CouplingExcess of 200 Hours of Continuous OperationDesiccant Dry-Down Chamber For Rapid MeasurementsSelectable Engineering Units in C, F, ppb(v), ppm(v), ppm(w), g/m lb/MMSCF