Controlled screw tightening in the most widely used range of 1 – 850 N·m / 0.75 – 630 lbf·ft (guide for screws M3-6.9 to M24-8.8, M30-5.6). Adjustable, releasing and sturdy tubular torque wrench with integrated ratchet and with square drive for industry and the trades Features:. Classified to DIN EN ISO 6789:2003 Type II Class A, with a factory certificate. Working accuracy: /- 3 % tolerance of scale set torque. The specification of the standard ( /- 4 %) is exceeded. For controlled bi-directional tightening. 1/4″, 3/8″, 1/2″ interchangeable mushroom head with ball locking device. As from 3/4″ with push through square drive with pin-locking mechanism. Sturdy, varnished tubular steel construction, with zinc-plated ratchet head and top-grade plastic parts. Ergonomically shaped, convenient black plastic handgrip with calibration aid. Dual scale N·m and lbf·ft below a window with a magnifying-glass effect. With micrometre scale for main N·m scale for setting interim values. Release system triggers a tactile and audible signal. Ergonomic system for torque adjustment.