The HP-Series display has an electronic luminescence back light source allowing the display to be read easier in poor lighting environments. Activate this feature by pressing the Light Bulb key. The back light will automatically turn off after 10 seconds. In addition, the HP-Series can be calibrated to ensure precision accuracy for all your weighing needs. We highly recommend you always purchase the optional calibration mass whenever you purchase one of the Ohaus HP-Series Handheld Scales .
Calibration is especially important if the scale is in use for prolonged periods.
Calibration could be easier and we have outlined the instructions below for you to review, but you must purchase this optional calibration mass to take advantage of this nice feature . The calibration instructions listed below are for the HP320. After pausing for at least two seconds, place a 200 gram calibration mass gently on the center of the weighing platform. The calibration is complete and successful when the display shows 200.0, and the stabilized indicator is displayed. Now turn on the calibrated scale and your ready to perform so precision weighing.