what type of batteries does this use and are they expensive?

It uses Lithium Battery 3V CR2032. They're not expensive. http://www.walmart.com/ip/INSTEN-5pcs-CR-2032-CR2032-3V-Lithium-Button-Cell-Coin-Battery/31515503

Two questions: 1. Will the scale stay 'on', giving you more time to add or subtract from the substance being weighed?

Yes. Seems like they all should do that since you are using it to precisely measure ingredients. This one does give you plenty of time to add or subtract.

is this weight calibrated?

This scale comes precalibrated with a readability of 1 gram and a weight capacity of 11 lbs. / 5 kg.

can you calibrate unit to a known weight if it gets off? ie the scale initially weighs an object to be 5g but over time the scale shows it as 7g

To calibrate, press the tare button or turn off and back on. Scales that weigh in small increments can easily be influenced by as little as a breeze, product spilled on the scale, or product left in a cup, etc. Placement of product at various positions can also affect the reading. Weight should not creep if item being weighed is left in a static situation. And lastly, a good set of calibration weights are always necessary to assure true readings.

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Smart Weigh Professional USPS Postal Scale with Tempered Glass Platform, Multiple Weighing Modes and Tare Function, Silver Shipping Scale, Platform Scale, 11 pounds/ 5 Kilograms

Smart Weigh Professional USPS Postal Scale with Tempered Glass Platform, Multiple Weighing Modes and Tare Function, Silver Shipping Scale, Platform Scale, 11 pounds/ 5 Kilograms

Product ID: 1144851

Details

Brand
Smart Weigh
Color
Black
Display Type
LCD
Recommended Uses For Product
Home Business
Special Feature
Auto Shut Off

🔍±1g / 0.1oz precision accuracy

🧊Tempered glass platform durability

⚖️11 lbs / 5 kg max capacity

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₹ 5392

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Sold byAmazon IndiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚖️ Ship Smart, Weigh Right — Precision Meets Professionalism

BUILT TO ENDURE - Tempered glass platform engineered for daily heavy use, combining sleek style with rugged reliability.
COMPACT PORTABLE - Space-saving design fits neatly in your workspace or drawer, ideal for home offices and on-the-go professionals.
PRECISION YOU CAN TRUST - High-accuracy sensor delivers exact weights down to 1 gram or 0.1 ounce—never second-guess your postage again.
VERSATILE WEIGHING MODES - Switch effortlessly between pounds, ounces, grams, and milliliters to handle any shipping or mailing need.
TARE FUNCTION FOR FLEXIBILITY - Zero out containers or packaging to get precise net weights—perfect for small business shipping or culinary tasks.

The Smart Weigh Professional USPS Postal Scale features a durable tempered glass platform and precision sensors that measure up to 11 pounds (5 kg) with ±1g/0.1oz accuracy. Designed for versatility, it supports multiple weighing modes and includes a tare function, making it perfect for small business shipping, mailing, and even kitchen use. Its compact, portable design and easy-to-read LCD display ensure seamless integration into any professional workspace.

Specifications

ASIN	B00FJFJDGS
Best Sellers Rank	#91,912 in Kitchen & Dining ( See Top 100 in Kitchen & Dining ) #326 in Kitchen Scales
Brand Name	Smart Weigh
Color	Black
Customer Reviews	4.7 4.7 out of 5 stars (2,916)
Display Type	LCD
Form Factor	Countertop
Global Trade Identification Number	00700358199363
Included Components	Digital Scale, USB Cable, Manual, Warranty Card
Item Weight	1.39 Pounds
Manufacturer	Smart Weigh
Material Type	Alloy Steel, Stainless Steel
Measurement Type	lb/oz/ml/g
Model	PL11B
Part Number	PL11B
Readout Accuracy	0.1 Ounces
Recommended Uses For Product	Home Business, Mailing, Postal, Shipping, Warehouse
Special Features	Auto Shut Off, Backlit Display, Large Display, Portable, Tare Function
UPC	065283195423 885233565409 885494961781 700358199363 778295206611 061644263671 885261089106
Unit Count	1.0 Count
Warranty Description	2 Year Manufacturer Warranty
Weigh Scale Type	Counter Scale
Weight Capacity Maximum	11 Pounds

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