Sealey calibrated micrometer torque wrenches sealey premier stw1012 this micrometer style torque wrench from sealey has a chrome vanadium steel ratchet head with smooth action mechanism each wrench is individually tested to standards with plusmn4 accuracy and each wrench is issued with an individually numbered test certificate sealey stw1012 torque wrench micrometer style 38sq drve 2 24nm147 1770lbft