The product usually takes 7--13 business days to arrive to your hand after your order is confirmed Product Description This instrument is a ZC3-A-type medium-sized hammer in line with JGJ / T23-2001 technical regulations. It is for the detection of concrete compressive strength range within 10-60Mpa, and system standard energy is 2.207J. Indication system is direct reading pointer type. Technical Datas Length of pointer: 20.0 .2(mm) Friction of pointer: 0.65 .15(N) Sphere semi-diameter at the end of the flip rod: 25 .0(mm) Rigidity of flip tensioned spring: 785.0 0.0(N/m) Location of flip hammer's hook release: "100"at the scale mark Length of flip tensioned spring: 61.5.0 .3(mm) Strike length of flip hammer: 75 .3 Hop location of the flip hammer: "0" at the graduated scale Fixed value of steel anvil: 80 weight: 3kg NOTE: we will send the product to you as soon as possible If you have any questions , please feel free to contact us