Fuji FL series non shut-off type pulse wrench features:Accumulator MechanismThe accumulator functions to compensate against the sudden rise of oil pressure when tightening a hard joint. Torque scatter and error is minimized. As the oil temperature increases during consecutive tightening, the accumulator takes in the expanded volume of oil to maintain a consistent oil volume in the pulse unit. This ensures high tightening torque accuracy.Environmentally Friendly DesignTo reduce effects on the environment and environmental energy during the life cycle of the tool, no paints is applied to th body of the tool. Consequently, the effect of paint peeling is eliminated. The fully cover protector is designed as standard.Ergonomic DesignCompared with conventional tools, weight is kept to a minimum. The grip handle size is optimized to provide enhanced levels of operator comfort. This special grip also absorbs vibration more effectively. Furthermore, reduced noise and vibration levels are standard with the FL series due to the optimized dimensions.