These Hilger Watts TB 95-3 Microptic Precision Clinometers are no longer manufactured, yet still highly useful. We have excellent examples, which upon order, will be sent to our NIST-traceable Calibration Lab to be Calibrated, and then sent directly to you, with your Company name on the Calibration Certificate. These instruments have a high-precision glass circle inside that, along with the highly sensitive bubble level and Optical Micrometer allow readings in the eyepiece to one arc second. All steel, glass and brass- meant to last a lifetime if handled with care. These are actually more precise than the TB100.