GemRed Digital Depth Guage Height Gauge for Router Table Apply to setting heights of saw blade, router bit, band saw etc. Measure range from 0 to 3 1/8" (0 to 80mm) Locking screw for holding measurement and repeat setting Plunger attachment for bore and slot measurement 1*CR2032 battery is included. Horizontal&amp;vertical measuring For hand router&amp;router table 60mm wide aperture&amp;accurate to 0.1mm Locking screw for holding measurement Digital display for wasy reading Self standing for setting cutter depth on router tables and low profile backfence adjustment <span class="a-text-bold">Measuring Range:</span>0~80mm (0~3 1/8&#034; ) <span class="a-text-bold">Hole Depth:</span>0~50.8mm(0~2&#034; ) <span class="a-text-bold">Working Temperature:</span>0C~+50C <span class="a-text-bold">Working Humidity:</span>&lt; =85%RH <span class="a-text-bold">Working Currency:</span>&lt;100A <span class="a-text-bold">Resolution:</span>0.05mm(0.002&#034; ) <span class="a-text-bold">Accuracy:</span>0.1mm (0.004&#034; ) <span class="a-text-bold">Repeatability:</span>0.1mm (0.004&#034; ) <span class="a-text-bold">Battery:</span>CR2032 3V Lithium Battery <span class="a-text-bold">Power Life:</span>&gt;1500 hrs <span class="a-text-bold">EMC Level:</span>2