1. Various Ruler length (600mm,800mm,1000mm,
   1200mm)                                                              

2. 360 degree measure range
3. Extra large LCD
4. Beeper will sound at:  0^o ,45^o ,90^o
5. Readout holding
6. Display always reads upright, no matter which
   way the level is turned.
7. The laser(purchase optional attachment) can
   be used for long range position

Tech data:

1. Range:  4*90^o(0~360^o)
2. Work temperature:  +5^oC~+40^oC                      

 3. Work humidity:  <=85%RH
4. Resolution:   0.1^o
5. Accuracy:   0^oand 90^o<=0.1^o
                        the rest<=0.2^o
6. Power:  3V(1.5v*2)  alkaline battery