Sealey calibrated micrometer torque wrenches sealey premier stw102 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 stw102 torque wrench micrometer style 12sq drive 40 210nm30 155lbft