This information was copied from the Davidson Optronics Website:
http://www.davidsonoptronics.com/catD-897.htm
AUTOMATIC AUTOCOLLIMATOR -- D-897
Davidson Optronics recommends the Model D-897 Automatic Autocollimator for use in laboratories that require a high degree of sensitivity (down to ±0.01 arc seconds). This unprecedented degree of precision will undoubtedly improve your laboratory's ability to make ultra-fine angular deflection measurements.
Features:
- First instrument able to repeat automatic readings to ±0.01 arc seconds
- 5-10 times more sensitive for closer, more accurate readings
- Continuous electrical servo output records and controls
- All solid state electronics with modular design facilitates repair
- Digital display corresponding to the target reflector ang