The horizontal optimometer IKG-3 is used to measure the inner diameters of products.
| Outside range, mm | 0-500 | 
| Internal range, mm | 1-200 | 
| Measuring lead table, mm | 0.01 | 
| Max. part weight, kg | ten | 
| Readout discreteness, μm | one | 
| Error no more, microns | ± 1 + 0.005L | 
| Measuring force, N | 2 ± 0.5 | 
| terms of Use | 20 ± 2 ° С, rel. humidity up to 60% | 
| Weight, kg | 127 | 
| Dimensions, mm | 1000x370x620 |