... sealed, frequencyadjustable, magnetic driven noiseless novel probe Optical equipment, made in China About RS8231 A/B Scanner Characteristics Basic ... ParametersB scan Probe: 10MHz sealed, frequencyadjustable, magnetic driven noiseless novel ... angle53° Grey scale:256 shades Display mode: B, B+A, B+B A Scan Frequency of probe: 10MHz solid probe, ...