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Topcon’s RL-100 Series revolutionary encoding system provides the highest grade repeatability, 5 arc seconds, of any other laser! No one even comes close. Setup-after-setup, time-after-time, you’re always right on grade! RL-100 2S features include:     * 5 arc second repeatability     * Wide grade range (up to +/-25%) without slope blocks     * Extra-long battery life (65 hrs)     * Increased range - up to 2,500 ft. (770m)     * Graphical display     * Full function remote Fully automatic self-leveling The RL-100 2S provides dual slopes up of +/-10% in single slope or up to an industry leading +/-25% dual slope. The RL-100 2S standard package includes the LS-80B laser sensor, sensor holder, batteries, plus the all-new RC-400 remote that allows complete control of the RL-100 2S up to 300’ away!       
Topcon RL-100 1S/2S
MODEL RL-100 1S/2S BEAM POWER Visible laser:685nm RANGE (radius) 1250 ft. ACCURACY 3/32" inches @ 100' POWER 4 "C" cell batteries  65 hours SENSOR LS-80B GRADE RANGE RL-100 2S: ±10/±25   RL-1001S -5 to +25 REMOTE CONTROL yes 2S only
The RL-100 1S Package Includes: • RL-100 1S Transmitter • LS-80B Laser Sensor • Sensor with Holder-6 • Operation Manual • 4 'C' Alkaline Batteries • 1 '9V' Battery • Hard Shell Carrying Case
Topcon’s RL-100 Series revolutionary encoding system provides the highest grade repeatability, 5 arc seconds, of any other laser! No one even comes close. Setup-after-setup, time-after-time, you’re always right on grade! RL-100 1S features include:     * 5 arc second repeatability     * Wide grade range without slope blocks     * Extra-long battery life (65 hrs)     * Increased range - up to 2,500 ft. (770m)     * Graphical display     * Fully automatic self-leveling The RL-100 1S provides single slopes from –5% to up to +25% in X or Y axis and comes complete with Topcon’s new LS-80B laser receiver, sensor holder, and batteries. Everything you need to get right to work.       
LS-80B