Electronic Double Dual Twin Beam 18" 450mm HEIGHT GAGE Digital .001'' Gauge Electronic Height Gage; Batteries NOT include. Requires 1 A76 battery. Range: 0-18"/0-450mm ; Resolution: 0.001"/0.01mm ; Repeatability: 0.01 mm Accuracy: 0-200 mm: 0.03 mm ; 200-400 mm: 0.04 mm ; 400-600 mm: 0.05 mm mm/inch conversion ; On/off switch ABS/INC ; switch-able and hold function Quantity: 1 ; Unit overall dimension: 4-7/8''L x 11-3/8''W x26''H