supply of digital outside micrometer range: 300 - 400 mmdigital outside micrometer range: 300 - 400 mm,digital outside micrometer range: 300 - 400 mm, least count: 0.001mm, code no. 340-520 of m/s. mitutoyo make or its equivalent in insize/ baker/ forbes/precision. features:- 1) wide measuring range with interchangeable with anvils. 2) measuring face of the spindle is carbide tipped. 3) ip 65 water /dust protection. 4) equipped with ratchet stop for constant measuring force. 5) oil resistant material used for all plastic parts. 6) extended battery life of approximately 2.4 years. [ warranty period: 30 months after the date of delivery ]