This Spectra-Physics model 1077 "Level-Eye" laser light detector was made in the early 1980s. After setting-up a laser-emitter a construction worker could use this detector to take readings and check for level on a job site. The unit has both a visual display and an audible tone to tell the worker when the detector is centered on the signal. It has two accuracy settings, plus or minus 1/8 of an inch or 1/16 of an inch.
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