AC power adapter, internal rechargeable battery
Affordable, compact, and portable, these scales offer fast parts counting wherever you need it. Take them through the warehouse or use them in your lab. With a built-in rechargeable battery that delivers up to 90 hours of operation on a single charge, you can use them for weeks without having to recharge.
It can output the total weight.
You must first be in the normal weighting mode. In order to enter the calibration parameter you must first hold down the "ZERO" key, and while holding the "ZERO" key you must then press the "TARE" Key. The display will show the revision number in the "Weight" display,the "Unit Weight" display will show "- - - - " requesting the password number to be entered. The default password is "0000" but other numbers can be set using the parameter menus. Press the  key four times. Press [M+/↵] until the display shows "CALI" Press [Tare] key to enter the calibrate mode. The display will show "ZERO" and when the appears stable press the [M+/↵] key to confirm. Then press the numeric keys to enter the calibrate mass value and proceed with the calibration.
This could be a calibration error. If you are able to re-calibrate the unit it should clear the error. If you cannot then the unit will need to come in for repair.
For both actually. Digital Counting scales look at the weight of the parts you place on the weighing platform and divide the weight by the number of pieces you entered, to compute the average piece weight (APW).
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