does this have a “pre-alert” that dings 5 minutes before the time is up?

No, it is a basic timer, count up/count down, easy to read, loud alert and it uses an AA battery. It's a work horse and a good timer but nothing fancy like a 5 minute pre-ding.

Is this made in China?

Very likely made in China. Made anywhere else in the world they would not be so inexpensive.

What is the purpose of the "on-off" switch? Doesn't it turn off when the "stop" button is pushed?

It's powered by a battery. When you hit the stop button it stops timing but the display stays on. To save the battery you can turn it off completely, that is turn off the display itself.

Can it be used as a stopwatch to measure how long something takes (starts at zero and adds time till stopped) or just countdown as an ordinary timer?

Item is as advertised. You set the time you want to "time out" and press "go" and timer counts backwards to zero, then alarms. Will not count up.. Not a stopwatch.

ASIN	B083QYS6YH
Best Sellers Rank	#1,338 in Kitchen & Dining ( See Top 100 in Kitchen & Dining ) #6 in Timers
Brand	AOUCE
Color	White
Date First Available	January 11, 2020
Item Weight	3.53 ounces
Item model number	Timer - 89
Manufacturer	AOUCE
Material	Plastic
Number of settings	8
Product Dimensions	2.68"D x 2.95"W x 0.79"H

2 Pack Digital Kitchen Timer for Cooking Big Digits Loud Alarm Magnetic Backing Stand Cooking Timers for Baking White

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