1Ohaus Corporation19A Chapin RoadP.O. Box 2033Pine Brook, NJ 07058-2033, USAOhaus Hand-Held Scale SeriesModels HH 120 and HH 320-OPERATING MANUAL-• The HH 120 and HH 320 only differ in weighing capacity. Unlessotherwise specified, the content of this manual applies to both models.• For best results, use the scale in the specified optimum operatingtemperature.• For best accuracy, perform your mass measurements in cleanenvironments, free of electrostatic and magnetic fields, dust and dirt,moisture, vibration and air currents.• Use your scale with care, gently loading items to be weighed onto thecenter of the pan. Avoiding rough treatment will aid in the life of yourhand-held scale.• Calibration weights are not provided with the scale.80250884.pmd 3/23/2005, 9:53 AM1