Is this accurate to 0.1 deg or 0.05?

According to the information on the Klein Website this is accurate to ±0.1° from 0° to 1°, 89° to 91°, 179° to 180°; ±0.2° at All Other Angles

Can you set this to 0 then find angle on table saw blade if table saw is out of level?

Yes, it measures relative angles, zero it on your saw table and it will accurately measure the angle you need.

Anyone get an error on start up?

tilted or out of range may trigger error

Can this determine the pitch (1/12, 2/12, 3/12....12/12, 13/12..etc.)??? Need to determine pitch angle for roofing, pipes...etc?

As said below, you can use it to calculate pitch indirectly. A 12/12 pitch is 45 degrees, zero the inclinometer on the top plate along the same plane as the trusses then transfer it to the truss. The measurement displayed will be the angle between the plate and the top of the truss. Most speed squares have the rise over run angle printed on them, if not: Roof Pitch = (1 ÷ Tangent (Rise ÷ Run))*180/π

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Description

📏 Elevate your craft with precision that sticks — literally!

BUILT TO ENDURE - IP42-rated water and dust resistance means this tool thrives in tough jobsite conditions.
READY WHEN YOU ARE - Compact, lightweight design with included batteries and soft case—professional-grade portability.
HANDS FREE EFFICIENCY - Powerful magnetic base secures to metal surfaces, freeing your hands for complex tasks.
VIEW ANYTIME ANYWHERE - Auto-rotating reverse contrast display ensures crystal-clear readings even in low light.
PRECISION MEETS VERSATILITY - Measure and set angles from 0° to 180° with zero calibration for flawless accuracy.

The Klein Tools 935DAG Digital Electronic Level and Angle Gauge offers dual measurement ranges (0-90° and 0-180°) with zero calibration for precise angle setting. Featuring a strong magnetic base for hands-free operation on metal surfaces, an auto-rotating reverse contrast display for easy visibility in any orientation, and IP42 water and dust resistance, this compact, battery-powered tool is built for durability and convenience on any jobsite.

Specifications

Brand	KLEIN TOOLS
Material	ABS Plastic Housing and Electronic Components
Product Dimensions	2.36"L x 2.2"W
Style	Level
Item Weight	3.5 Ounces
Operation Mode	Automatic
UPC	092644692376
Global Trade Identification Number	00092644692376
Manufacturer	Klein Tools
Part Number	935DAG
Item Weight	3.5 ounces
Item model number	935DAG
Batteries	2 AA batteries required. (included)
Is Discontinued By Manufacturer	No
Size	Level
Power Source	Battery Powered
Item Package Quantity	1
Special Features	V-grooves Around Entire Perimeter, Dual Measurement Ranges at 0° to 90° and 0° to 180°, Reverse Contrast
Included Components	Soft Carrying Case, Instruction Manual, Batteries
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Description Pile	Yes\|2 x 1.5 AAA
Warranty Description	1 Year Manufacturer