... , 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 ... . Higher resolution2. B, B+B, B+A, A features3. Zoom from 34mm~60mm4. Variable displaying area5. Adjustable TGC6. ... : -30dB~0dBScanning scope: angle: 53 degree Depth: from 34mm to 60mmGray scale: 256Cineloop: 5.6sec/56images; ...