How can you tell the weight of large boxes that block the view from the led screen?

There is hold function. you can press HOLD key to lock the numbers and then you can remove the big box. Thank you

Self calibration option??

Scale does NOT have an internal calibration feature. You must use an external calibration weight that weighs exactly 2 Kg or 5 pounds to calibrate the scale at the location where it will be used. See "Scale Calibration and Verification" in REVIEWS section below for a comprehensive explanation. The TARE feature only temporarily resets the scale to ZERO, and is only used when the item to be weighed must be placed in a container (such as weighing liquids) and the container's weight is to be excluded.

If the accuracy dimishes over time, can it be recalibriated against a known weight (like a 5 lb dumbell)? Thanks.

yes, with a calibration weight. Most dumbbells, aren't the exact weight. For instance, 5 lbs dumbbell usually 4 lbs something or 5 lbs something. It's not exact 5 lbs.If you are insist on using a dumbbell, use olympic standard dumbbell

ASIN	B01MT86A1I
Batteries	2 AAA batteries required. (included)
Best Sellers Rank	#9,688 in Office Products ( See Top 100 in Office Products ) #9 in Postal Scales
Brand	Weighmax
Color	Stainless Steel
Date First Available	January 11, 2017
Display Type	LCD
Form Factor	Handheld
Global Trade Identification Number	00692016110219
Is Discontinued By Manufacturer	No
Item Weight	2 pounds
Item model number	W-2809-90BLK
Manufacturer	Weighmax
Material	Stainless Steel
Product Dimensions	6.6 x 1.5 x 9.6 inches
Readout Accuracy	0.1 Ounces
UPC	692016110219
Unit Count	1.0 Count
Weigh Scale Type	Counter Scale
Weight Limit	90 Pounds

W-2809 90 LB X 0.1 OZ Durable Stainless Steel Digital Postal Scale, Shipping Scale With AC adapter, 1 Pack

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