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 Pro, Never Miss a Beat!

ALL IN ONE PRO KIT - Includes rugged metal case and user manual—ready to elevate your toolkit instantly.
CERTIFIED QUALITY ASSURANCE - ISO 6789 calibration certificate guarantees professional-grade reliability and trust.
VERSATILE MEASUREMENT MODES - Switch seamlessly between ft-lbs, in-lbs, N-m, and Kg-cm for any project or standard.
PRECISION AT YOUR FINGERTIPS - Real-time torque readings with buzzer & LED alerts ensure flawless accuracy every time.
BUILT TO LAST DESIGNED FOR COMFORT - Ergonomic soft grip and lightweight alloy steel body reduce fatigue during extended use.

The ACDelco ARM303-4A-340 is a heavy-duty digital torque wrench offering a wide torque range of 12.5 to 250.7 ft-lbs, featuring an easy-to-read LCD with buzzer and LED notifications. Engineered with durable alloy steel and ergonomic design, it supports multiple measurement units and comes calibrated to ISO 6789 standards, making it an essential precision tool for automotive and industrial professionals.

Specifications

Manufacturer	ACDelco
Part number	ARM303-4A-340
Item Weight	10 g
Product Dimensions	5.08 x 5.08 x 66.68 cm; 10 g
Batteries	2 CR2 batteries required.
Item model number	ARM303-4A-340
Size	1/2"
Style	Wrench
Finish	Polished
Material	Alloy Steel Aluminum
Power source type	Battery Powered
Voltage	1.5 Volts
Torque	2.5E+2 Foot Pounds
Item Package Quantity	1
Head Style	Fixed Ratchet
Measurement System	Metric
Included components	Metal Case, User Manual, Digital Torque Wrench, Calibration Certification
Batteries Included?	No
Batteries Required?	Yes
Battery Cell Type	Lithium Manganese Dioxide

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