This 3/8" square drive ratchet torque spanner from Draper Tools is a handy tool for professional or occasional use.

The spanner's handle has a rotating barrel to accurately set the desired torque mechanism with engraved Nm and lb-in scales. When the set torque is reached, the spanner produces an audible click and slightly releases tension. This torque spanner is supplied in a blow-moulded case for easy storage and transport.