ITEM NAME:Precision Non-Contact Tachometer W/Extended RPM Range, Digital LCD Screen, Description: DT2234C non contact digital tachometer. Using high quality plastic material can resistance Chemical corrosion and heat. Wide measuring range and high resolution. Measures exact RPM with no guessing or errors. Automatically memorize maximum, minimum and last measured value. Specification: 5 digits 18mm (0.6") LCD Accuracy: Â ±(0.05%+1 digit) Sampling Time: 0.5sec(over 120RPM) Range Select: Auto-Ranging Memory: Max. value, Min. value, Last value Measuring Range: 2.5~99,999RPM Resolution: 0.1RPM(2.5~999.9RPM) 1RPM(over 1,000RPM) Detecting Distance: 50~500mm Battery: 4x1.5V AA battery (Not be included) Time Base: 6MHz Quartz crystal Time Base Accuracy: 10x10-6(0~50Â °C) Dimension: Approx. 180 (L) x 70 (W) x 29 (D) mm Package Includes: 1 Piece DT2234C non contact digital tachometer Note: Please allow 0.1-0.5 inch difference due to manual measurement.(1 inch=2.54cm) Please check the size measurement and the picture carefully before making.Resolution: 0.1RPM(2.5~999.9RPM). 1RPM(over 1,000RPM). 5 digits 18mm (0.6") LCD. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Range Select: Auto-Ranging.