CS6FR Calibration Station for Total Station, Theodolite, level Optical CCD camera tube function very good. Everyone's eyesight is different, so observe by eyes has error.Showing by screen avoid eyesight error. More calibration station detail from: http://www.simaisurveyinginstrument.com/Calibration%20Station.html More products videos from: https://www.youtube.com/channel/UCVgQJEHDZTclZCWsKGDTxKw If anybody interested, please feel free to contact with me. Mr.Lee Sales Manager International Trade Dept. Mob: +86-15656585389 Tel: +86-0551-65420563 Whatsapp: +8615656585389 Linkin: SIMAI SURVEYING INSTRUMENT CO., LTD Mr.Lee Skype: smglee1985 Facebook: http://facebook.com/SIMAISURVEYINGINSTRUMENT Wechat: +86 15656585389 Email:lee@simaisurveyinginstrument.com info@simaisurveyinginstrument.com Website: www.simaisurveyinginstrument.com www.smartmaxgeosystems.com SIMAI SURVEYING INSTRUMENT CO., LTD ADD:NO.293 LIANHUA ROAD, ECONOMIC AND TECHNOLOGICAL DEVELOPMENT ZONE, HEFEI ...