I have a older model D-Teminator That takes a single 9 volt battery .Are the calibration instructions different for this model versus the model that I downloaded a manual for from you website that takes the AA batteries?  .This older Model has a Tare mode  and Goes up to 1500 Grains .Is there a manual I can get for this model? I basically want it to calibrate which currently check weight

s  about 2 percent lower.Thanks, Waymore1