I have a vintage Schultes ALUMA-LITE 24", 6-Vial Level I-Beam that is in excellent condition. The double vial in each of the 3 windows, known as 'spirit' vials, improves accuracy without having to flip a single-vial level 180 degrees to check for deviation in a level or plumb line. Made in Detroit, Michigan by the now defunct Schultes Level Company, these levels have become collectible while remaining true to their intended functional purpose - a testament to the quality advocated by company founder Joseph Schultes and his sons, John and Vincent. $35
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