... B, B+B, B+A, A features 3. Zoom from 34mm~60mm A/B Scan(A scan,B scan),Optical instrument About RS8229-I A/B Scan, A scan,B scan Description1 . Higher resolution2. B, B+B, B+A, A ... measurement12. Save for up to 50 groups a measurement results13. Trackball for easy measurement and ... or circleMemory: 8 imagesDelay control:0mm~15mm A mode:Frequecy: 10MHzMeasuring method: immersion/contactBiometry accuracy ...