Vintage Carlson Spring Tester, Model CST-20, with original Federal Products Corporation packaging.
Designed for precision spring force/load testing, this large analog tester features a two-revolution dial and adjustable reference markers.
Specifications shown on dial:
Includes the spring tester and its original fitted Federal box/packaging shown in photos.
IMPORTANT: This is vintage measuring equipment and has not been professionally calibrated or certified. No guarantee is made regarding current measurement accuracy. Buyer should have the instrument inspected/calibrated before relying upon it for precision or safety-critical applications.
Basic mechanical response tested: the large dial needle moves when pressure is applied to the blue end. Accuracy and calibration have not been verified; no further testing performed.
Please see photos for additional specifications, construction details and condition.
Vintage precision industrial measuring equipment suitable for machine-shop, manufacturing, engineering, inspection, restoration or collectible use.
Condition: Pre-owned vintage industrial spring tester in good overall cosmetic condition for age. Shows age-related wear, discoloration, spotting and surface oxidation as pictured. Original Federal Products Corporation box shows storage and edge wear. Unit has not been professionally calibrated or certified for accuracy. Please review all photos carefully for exact cosmetic condition.