Use our 270BN Universal Short Range Calibration Test Stand to calibrate just about any optical instrument (Optical Tooling, theodolites, total stations, automatic levels, etc). Our 470NA Calibration Sine Bar is an excellent tool when you need to generate angles with extreme precision (like testing autocollimators or electronic levels). Measure angular deviation of a line of sight with our optical wedges. Test eyepieces with our diopter tester. Our bubble vials will help keep surfaces and instruments on the level.