retroreflectometer with 2 repeatability error

{"cid":"91200138","title":"On Site Measuring Retroreflectometer With Simple Calibration Procedure","imgUrl":"https:\/\/img.chinax.com\/nimg\/e5\/cb\/8522dca740ac770a85e6cae68ba9-200x200-1.jpg","attrs":{"Price":"negotionable","Brand Name":"STP","Model Number":"STP-NRRM","Minimum Order Quantity":"1","Certification":"ISO9001","Place of Origin":"CHINA","Payment Terms":"T\/T, Western Union, MoneyGram","Supply Ability":"1000","Packaging Details":"inner box and master carton , 1pc per carton . carton size : 55*36*23CM","Keyboard":"Chinese and English","The whole machine size":"L310*W140*H230\uff08mm\uff09","Detection modes":"dry mode, wet mode and rainy night mode","Power supply voltage":"12V DC","The total weight":"9Kg","Charging voltage\/current":"DC12.6V\/2A","Ambient humidity":"\uff1c98%, no frost","Outer packing size":"L550*W350*H165\uff08mm\uff09","Ambient temperature":"-15\u2103~+60\u2103","The whole machine net weight":"2.85Kg"}}