What is the difference between fluke 2ac and fluke 1ac-a1-ii?

The 2ac is the newer model with an "always on" function. It has a button that is used only to ensure that it still has battery power. The 1ac is the older one that can be turned on or off. They both test for voltage presence the same way, but the 1ac has an audible alert function which the 2ac does not have.

What's the difference between the 1ac and the 2ac?

The 1AC has an audible alert and can be turned on or off.The 2AC stays on always and does not have an audible alarm.

can it be manually turned on without pressing the pocket hook

It doesn't turn off, it's always on. When it reads the electrical signal it glows, no sound or buzz.

Will it find AC behind drywall? Stud sensors are useless!

you could try using a toner kit. i think the proper term is wire tracer. the wand/probe can detect weak signals if you turn up the sensitivity. with some practice, you could use it to find ac wires behind drywall.

ASIN	B004I9J4DI
Batteries	2 AAA batteries required. (included)
Best Sellers Rank	#6,909 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #9 in Voltage Testers
Brand	Fluke
Color	White
Date First Available	January 7, 2011
Global Trade Identification Number	00095969564434
Is Discontinued By Manufacturer	No
Item Weight	0.353 ounces
Item dimensions L x W x H	10.24 x 7.6 x 1.57 inches
Item model number	FLK2AC/90-1000V
Language	English
Manufacturer	Fluke Corporation
Maximum Operating Voltage	1000 Volts (AC)
Measurement Type	Voltmeter
Min. Operating Voltage	20
Power Source	Alkaline
Product Dimensions	10.24 x 7.6 x 1.57 inches
Specification Met	CE, ETL, NIST, RoHS, UL
Style	ACV DETECTOR 90-1000V
UPC	095969564434 646635095389 095969564427
Upper Temperature Rating	50 Degrees Celsius

2AC Alert Voltage r

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