... cost, No-paper, Non-pollution, High-precision, High-reliability, do not like echo sounder that use belts and record penHigh ... mode , Auto zoom mode, Manual zoom mode Technical SpecificationScreen: 6-inch TFT color LCDRange: 0-800mAuto range: YesAuto gain: ... YesBrightness adjustment: 6 stagesDisplay speed: 8 stages including: *4, *2, *1, /2 ...