Alpha XD Servo self leveling, high performance, rugged design and extreme distance. When taking extremely long grade shots is a must, the Pro Shot™ Alpha XD laser level tool delivers the industry leading performance you need.  All of the great features and specs from the standard Alpha, plus a 3300ft (1km) radius coverage area.  Specifications 3300’ dia., 1650’ rad. (1km/500m) ± 10 arc sec. (± 1/16" per 100') (± 1.5mm per 30m) Servo motor • ± 5 degrees Single axis, X-axis self-leveled • 8% Normally active, can be disabled 360º • 600 or 1200rpm. selectable Yes, including high speed rotation 24 Month defects coverage Four C-cells • 90 hrs. (alkaline) Optional Ni-Mh kit • 65 hrs. Visible 670nm CDRH class IIIa • IEC class 3R To international standard IP56 -4º F to +140º F (-20º C to +60º C) Designed to withstand a 3ft (1m) drop or 5ft (1.5m) tripod knock-over on concrete XD range - R8 laser receiver . Accuracy ............................ Self leveling type • Range ..... Slope matching • Range ....... Height alert ........................ Rotation coverage • speed .... Machine control compatible ... Warranty............................. Power source • Life .............. Rechargeable batts. • Life ..... Laser beam type ................. XD Laser classification ......... Dust and water sealed .......... Operating temperature ......... Built to be jobsite tough ....... Alpha XD system including R8 receiver and carrying case $1,149.00 US list price