I had the same model, it was brilliant whan working very accurate. But it died (batteries started to get hot and smelly) would need to be fixed at Daystate they had serviced it and fitted new batteries around 12 months earlier. But now out of warranty so more expense you are totally in their hands.
So make sure its been serviced and the batteries are good and the power is at around 11.3 ft/lb. consistent and accurate. Best of luck, I think you will need it. Buyer beware.