Can the power saving function be turned off? If its plugged in, I would need it to stay on for as long as needed.

As far as a power saving feature I am not sure. However either way weather it is plugged in or just running off battery power, the machine does stay on. I have had mine for a while now and I love it. Definitely worth the money and is a great buy.

What is the USB cable used for?

The milligram scale is dual powder supply, AAA batteries or USB cable. But the scale is not rechargeable.

It says "Power saving funtion", how long before it turns itself off?

My set arrived broken and I never got to use them. Unfortunately I can't answer thos from personal experience. However, I have used a close friends set they bought at the same time I bought mine and they worked great but I don't recall seeing this function on the scales. The manual said something like it would actually power down in power saving mode after 30 seconds. I think. Sorry I can't be clearer on this.

ASIN	B09K5CZDML
Batteries	2 AAA batteries required. (included)
Best Sellers Rank	#387,651 in Kitchen & Dining ( See Top 100 in Kitchen & Dining ) #992 in Digital Kitchen Scales
Brand	Perphin
Color	black
Date First Available	February 11, 2022
Display Type	LCD
Form Factor	Mini
Item Weight	0.705 ounces
Manufacturer	PERPHIN
Material	Plastic, Stainless Steel
Package Dimensions	7.64 x 5.35 x 2.13 inches
Readout Accuracy	0.001-grams
Recommended Uses For Product	Medicines, Powder
UPC	797221862189
Unit Count	1 Count
Weigh Scale Type	Counter Scale
Weight Limit	50 Grams

Milligram Scale 50g by 0.001g, Mg Scale USB, Digital Powder Scale, Large LCD Display, Mg Scale for Powders, 6 Weighing Units, Precision Milligram Scale for Reloading Capsule Supplement Medicine

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