Bosch Red Beam Rotary Laser Receiver LR1 ACCURACY: The Bosch LR1 Red Beam Rotary Laser Receiver increases rotary laser detection up to 650 feet within an accuracy of +/-1 mm / +/- 3 mm. EASY-TO-USE: With a dual-sided LCD display, the LR1 allows for easy visual readouts on both sides of the laser receiver. ATTACHABLE: The Bosch LR1 includes built-in heavy duty magnets for secure attachment to metal surfaces and convenient rotary laser detection at greater distances. CLEAR READOUTS: The LCD arrow display and selectable audio signal give clear high/low on-grade position indication. COMPATIBLE: The Bosch LR1 Red Beam Rotary Laser Receiver works with Bosch and most red-beam rotary lasers