Topcon LS-100D - Digital Laser Sensor with Bracket- LS-100D

The LS-100D sensor
  offers three colored LED’s and a magnet mount for   vertical operation, which is designed to be useful for steel erection or   operator grade-checking while excavating. Alert icons appear on the LCD   if the accompanying Topcon rotating laser instrument is disturbed (HI   alert) or when the laser battery is low.
Topcon Laser Sensor 
Model Number: LS-100D 
Description: 
  Designed for maximum user convenience, the LS-100D features a   digital readout to confidently deliver elevation and vertical alignment   control on demand.
  Features an extra-wide beam capture sensor that also rejects annoying interference from strobe light exposures.
  The large and bright LCD displays (on front and back) feature   9-channels of grade information and digitally show the distance to   on-grade.
  By pressing the HOLD button, the display is locked so the user can conveniently read the results.
  Three colored LEDs and a strong magnet mount are embedded for vertical operation
  Ideal for steel erection or operator gradechecking while excavating
   Alert icons appear on the LCD if the instrument is disturbed or when the laser battery is low
Specifications: 
  Working Range (diameter): 800m with the RL-H4C, RL-SV2S, and RL-200 Series
  Vertical Detecting Range: 90mm (3.5 in); (-30mm to +60mm); (1.1 inch to +2.3 in)
  LCD Digital Readout Range: 70mm (2.7 in); (-20mm to +50mm) (-0.7 in to 1.9 in)
  Horizontal Detecting Range: +/- 45 degrees
  Strobe Light Suppression: Yes
  Units: mm/cm/inch/fractional inch
  On-Grade Resolution: +/-0.5 mm, +/-1.0 mm, +/-2.0mm, +/-5.0mm,   +/-10.0mm (+/-0.02 in, +/-0.05 in, +/-0.10 in, +/-0.20 in, +/-0.50 in)
  LCD Grade Indicators: 9-channels
  LED Grade Indicators: Orange, Green, Red (On/Off selectable)
  Display: LCD on each side
  Buzzer: Loud/Low/Off selectable
  Bubble Tube: Yes
  Warning Icons: HI alert, Low Battery (for the RL-H4C, RL-SV2S, and RL-200 Series)
  Battery: One AA/LR6 dry-cell battery
  Operating Time: UP to 45 hours with alkaline batteries
  Battery Level Indicator: LCD Icon
  Auto Shut-Off: Approz. 30 minutes
  Dust/Water Rating: I67 (IEC 60529)
  Operating Temperature: -20 degree C to 50 degree C
  Dimension: 134 x 69 x 25mm
  Magnet Mount: Two round magnets on top
  Sensor Holder 100: Screw mount (standard)