Nanchang 星枫 Instrument Co., Ltd. (www.xingfengyiqi.com) is located in Nanchang, Jiangxi Nanchang Road Qingyunpu three No. 44, Contact: Zhengjing Features: Non-contact speed measurement! Simple and easy to operate! Automatic shift! Do not operate within 20 minutes automatic shutdown! Low voltage display! Reserved maximum / minimum / average! Specifications: Measuring range 10 to 99999 RPM RPM Resolution 0.001 / 0.01 / 0.1 / 1RPM Accuracy 0.04% ± 2dgts reaction time of 1 second (> 60 rpm)> 1 秒 (10 ~ 60 rpm) Display LCD display features five digits retain the maximum / minimum / average Model: DT-2857 Product name: Laser Tachometer DT-2857 Price: 0 Brand: Domestic Product Category: Physical properties testing equipment measuring range: 2.5 to 99 tachometer outlets, 999 rev / point accuracy: ± (0.05% n +1 d) Resolution: 0.1 / 1 Memory: max / min / last value. Measuring range: 2.5 to 99,999 rev / min Accuracy: ± (0.05% n +1 d) Resolution: 0.1 / 1 Memory: max / min / last value. Measuring range: 2.5 to 99,999 rev / min Accuracy: ± (0.05% n +1 d) Resolution: 0.1 / 1 Memory: max / min / last value.