Vertical collimator offer, Jinke instrumentation (certified), vertical collimator provided by Qingdao Branch of the Instrument Co., Ltd. Qingdao Branch of the Instrument Co., Ltd. (www.qdjk17.com) is specialized in the "mapping equipment, analytical instruments, testing equipment, flow meters, optical instruments, temperature instruments," the enterprise, the company of "honesty, hard service" concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Li Yongjie. Model LDM-65 LDM-70 Measuring range 0.05-65 m 0.05-70 m Accuracy ± 1.5 ± 1.5 millimeters 毫米 measuring meters, inches, feet, meters, inches, feet, measuring 20 group 20 group history Laser class II Maximum output power <1mW II Maximum output power <1mW protection IP54 dust and waterproof rating IP54 dust and waterproof rating Operating temperature 0 ℃ ~ 40 ℃ 0 ℃ ~ 40 ℃ Storage temperature -10 ℃ ~ 60 ℃ -10 ℃ ~ 60 ℃ Dimensions 115 * 48 * 28mm 115 * 48 * 28mm Weight 135 grams 135 grams is detected, Hammer should always be perpendicular to the axis of the detection surface of concrete structures or components, slow pressure laser vertical collimator, accurate readings using a vertical collimator, quick reset. Presumption of concrete strength: 1, from 16 rebound values ??measured in the area, excluding the three maximum and three minimum, then the remaining 10 rebound values ??averaged. 2, as the rebound and non-member non-horizontal test surface, the angle should be more positive, more positive rebound value again after pouring more positive side. 3. The value of the survey area carbonation depth and resilience values ??more positive after the isolated strength concrete conversion value of the measuring area. 4, when the measured intensity values ??district structure or component of vertical collimator offer less than 10.0MPa appears, take fcu, e <10.0MPa. fcu, min 5, when the structure or component of the survey area is less than 10 when, fcu vertical collimator, e = 6, when the number of the surveyed area structure or component is not less than 10, or by granting detection fcu, e = fcu, m-1.645 * s 7, when one of the following occurs by measuring the strength of concrete members area standard deviation batch testing, should all by a single component detection: ① concrete compressive strength less than the average of 25.0MPa, S> 4.50Mpa; ② concrete the average compressive strength of not less than 25.0MPa and not more than 60MPa, S> 5.50Mpa