The TLV is limited to two-handed mono-lifting tasks performed within 30 of the sagittal plane, so task requiring a large amount of trunk twisting should not be analyzed with this tool. Additionally, the ACGIH states that the guide does not apply to tasks where are >360 lifts per hour, lifting more than 8 h per day, constrained body posture, high heat or humidity, lifting unstable object, poor hand coupling,unstable footing.