Power supply (V): 1 x button-type silver oxide battery (SR44) (included) Measurement data output terminal included Tolerance judgment function included Tolerance judgment enlarged display function included Measurement range (mm): 12-25 Minimum display (mm): 0.001 Manufacturer code: 568-956 Set内容:1单位12-16mm,16-20mm,20-25mm,1套环(φ16,φ20),2扳手