Stainless steel made Hole Test or Three Point Micrometer is used for measuring deep holes. It comprises of alloy steel made multiple contact points and ratchet stop for applying force consistently. Optional extension rod of this Hole Test or Three Point Micrometer is suitable for precise measurement of holes having specific depth. Parameters of its setting ring can be adjusted to zero point as part of its optional features. Silver in color, this instrument has 10 mm to 50 mm width range. Standard of this instrument has been verified on the basis of its dimension, longevity, strength, performance and mechanism.