All load proving ring offer a consistently high order of accuracy and repeatability. Clamped boss proving available in the range 1 kN to 100 kN. These proving are calibrated in accordance BS 1610 and issue with calibration certificate. The repeatability is within ± 0.2% of indicated load. The proving ring can be fitted for marshall, CBR UU and unconfined test. Supplied with in-house calibration certificate & carry case.