We are offering forest vernier caliper. technical details : non monoblock type hardened steel construction with fine adjustment and locking screw long jaw helps in checking thickness in deep hard to reach places keywords: forest caliper, alloy tree caliper, tree measuring calipers, aluminum tree caliper, long jaw vernier calipers size in mm /inch least count in mm/inch jaw lenth 500/20” 0.02mm/.001” 150mm 1000/40” 0.02mm/.001” 200mm guarantee 6 months packing wooden box / aluminium box calibration optional/ extra