This is a professional universal torque wrench with high accuracy and practicality. It can be widely used in machinery, aviation, railway, maintenance, inspection and other fields. Features: Large screen makes reading data more convenient and clear. Just add a common ratchet wrench to become a digital torque wrench with the same function as a normal torque wrench. Full-featured, small and compact, easy to use and carry. It can be widely used in machinery, aviation, railway, maintenance, inspection and other fields. The storage box can better protects and store it. Specifications: Material: ABS+steel Color: black Battery: 2 * AAA battery, 1.5V (not included) Type: BDA2-030, BDA3-135, BDA4-200, BDA4-340 (optional) Accuracy: ±2% Memory: 50 Resolution: 0.1 Display range: BDA2-030: 0.3-30Nm BDA3-135: 1.35-135Nm BDA4-200: 2-200Nm BDA4-340: 3.4-340Nm Alarm range: BDA2-030: 1.5-30Nm BDA3-135: 6.8-135Nm BDA4-200: 10-200Nm BDA4-340: 17-340Nm Accuracy guarantee range: 20-100% of max torque Drive: BDA2-030: 1/4" BDA3-135: 3/8" BDA4-200: 1/2" BDA4-340: 1/2" Model: peak/trace Units: Nm/Kg.c-m/Kg.m/lb.in/lb.ft Auto shut off: 70 seconds (if do not use digital torque adapter) Item size: 75 * 45mm / 3.0 * 1.8in Item weight: BDA2-030: 140g / 4.9ounce BDA3-135: 210g / 7.4ounce BDA4-200: 210g / 7.4ounce BDA4-340: 210g / 7.4ounce Package size: 120 * 95 * 65mm / 4.7 * 3.7 * 2.6in Package weight: BDA2-030: 250g / 8.8ounce BDA3-135: 320g / 11.3ounce BDA4-200: 320g / 11.3ounce BDA4-340: 320g / 11.3ounce Package list: 1 * Digital Torque Wrench 1 * User Manual 1 * Box