OSN’s range of O-ring measuring cones enables the dimensions of an O-ring to be identified quickly, easily and reliably when its reference is unavailable. Their conical, graduated design facilitates checking the inside diameter. With both models, a vernier caliper must be used to determine the O-ring cross-section or cord thickness. These tools are particularly useful in maintenance, repairs, warehouses, workshops and technical departments that regularly work with O-rings manufactured to different standards.