Highly crossed caliper, on the main scale read an integer, such as 10mm 
 2, the readout dial decimal places. Each representative of the small grid 0.02mm, 5 small cell 0.1mm, dial the number. 
 Readings are read out after which number is the first decimal value, for example, is 0.5; small number of cells coupled with the digital * 2 is the second value, such as small cell , is 0.06. 
 Finally, put all the numbers add up, such as 10.56 mm 
 Dial semi-circle before and after half a lap, just look at the digital readout. Dial calipers, also known as Schedule caliper. It is the use of the rack drive gear to drive the pointer display value on the main scale, the approximate scale, combined with the indication of meter readings, the more quickly and accurately than a vernier caliper readings. With table calipers are not afraid of oil and water, but need to pay attention to in the course of shock and dust. Vibration at worst will lead pointer offset zero weight will lead to internal movement and gear from the impact indication. The dust will affect the accuracy, large iron filings into the rack, carefully pull will cause the drive gear crack caliper scrapped. Dial calipers is the length of the class precision instruments, need to get light in the course of light, after use, wipe clean, closed the caliper, to avoid harmful dust and iron filings into! Then there are the table with a caliper using two-way shock, this caliper shockproof effect will be better! The value of the indicator: There are the 0.01,0.02,0.05 three kinds. Indicate the length of the table pointer revolution instructions, 0.01 part of 0.02 to 1mm, 2mm, the indexing part of the value of 0.02 caliper of sub-degree value of 0.05 to 5mm. With Table vernier caliper measuring range: 0 ~ 150,0 ~ 200,0 ~ 300 three with Table vernier caliper indication error: measuring range table points is 0.01 and 0.02 Table value of 0.05 from 0 to 150 ± 0.03 0 ~ 200 ± 0.03 0 ~ 300 ± 0.04