If it is shown that the torque readings are not correct, can the torque calibration be adjusted by the owner of the wrench? Or is it non-adjustable?

I don’t think or I don’t know of a feature to calibrate the wrench. On a normal car it is 100lbs. And, it varies depending on make and vehicle. You will have to google it. But, 100lbs it is tight.

Does this does angle measurement for engine head bolts ??

When you power it on, you need to leave it on a flat surface when you see 00000. It is calibrating the Angle accelerometer. If you keep moving it around, it will take forever to boot.

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Description

🔧 Torque Like a Boss — Precision You Can Feel

COMPLETE PRO KIT - Includes calibration certificate, hard-shell case, and user manual—everything you need to own your craft.
ERGONOMIC MASTERY - Lightweight 6.6 lbs design with soft-grip handle reduces fatigue during long projects.
PRECISION MEETS POWER - Achieve exact torque with ±1.5% accuracy for clockwise turns and ±2.5% for counterclockwise.
BUILT TO LAST BUILT FOR PROS - Industrial-grade alloy steel body with polished finish ensures durability and professional-grade reliability.
SMART ALERTS FOR FLAWLESS WORK - Audible buzzer and LED flash notify you instantly when target torque is reached—never second guess again.

The ACDelco ARM303-4A-340 is a heavy-duty 1/2" digital torque wrench offering a wide torque range of 12.5 to 250.7 ft-lbs with ±1.5% accuracy. Featuring a clear LCD display, audible buzzer, and LED flash alerts, it ensures precise torque application in both clockwise and counterclockwise directions. Crafted from industrial-grade alloy steel with an ergonomic soft-grip handle, it balances durability with comfort. This professional-grade tool comes with a calibration certificate and a protective hard-shell case, making it ideal for automotive, motorcycle, and industrial use.

Specifications

Color	Black/Red
Brand	ACDelco Tools
Material	Alloy Steel
Item Length	66.7 Centimeters
Item Weight	0.01 Kilograms
Item Package Quantity	1
Head Style	Fixed Ratchet
Finish Type	Polished
Item Torque	2.5E+2 Foot Pounds
Operation Mode	Battery
Voltage	1.5 Volts
Manufacturer	Durofix, Inc.
Global Trade Identification Number	04716872175420
Part Number	ARM303-4A-340
Item Weight	0.352 ounces
Item model number	ARM303-4A-340
Batteries	2 CR2 batteries required.
Is Discontinued By Manufacturer	No
Size	1/2"
Style	Wrench
Finish	Polished
Power Source	Battery Powered
Measurement System	Metric
Included Components	Calibration Certification, Digital Torque Wrench, Metal Case, User Manual
Batteries Included?	No
Batteries Required?	Yes
Battery Cell Type	Lithium Manganese Dioxide
Warranty Description	1 Year Limited Warranty

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