Zero reading: ±0.25 division
Spring constant: 12±0.25 lb/inch (2.142±.045 kg/cm)
Load required to read: 3.0 ton/ft2 (3kg/cm2 ) 11.25±0.55 lb (5.104±0.249 kg)
Load required to read: 4.5 ton/ft2 (4.5kg/cm2 ) 17±0.85 lb (7.713±0.386 kg)
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