Model: Testo-470 Product Name: Testo-470 tachometer Price: 0 Brand: Germany Testo product categories: physical properties testing equipment Tachometer Testo-470 optical and mechanical dual tachometer. Speed ??can be measured by a mechanical-contact sensors mounted on a mechanical speed post. · Single-handed operation · measure speed, velocity and length · "low battery" warning Technical data probe types using optical reflection principle of speed measurement range +1 ... +99999 rpm Accuracy ± 0.02% of mv (+1 ... + 99999 rpm) Resolution 0.01 rpm (+1 ... +99.99 rpm); 0.1 rpm (+100 ... +999.9 rpm); 1 rpm (+1000 ... +99999 rpm) Operating temperature 0 ... + 50 ° C Storage temperature -20 ... +70 ° C Battery Type 2 AA batteries Dimensions 175x60x28 mm Weight 190 g 1 year warranty Model: DT2240D Product Name: DT2240D disk tachometer Price: 0 Brand: Domestic Product Category: physical properties testing equipment Measuring range: 5.0 ~ 99990RPM Accuracy: ± 0.05% 4-digit red LED display with automatic shift required proximity switches or photoelectric switch Size: 96 X 48 X 104mm tachometer tachometer affordable principle _ Jilin tachometer tachometer _ 星枫 instruments provided by 星枫 instruments. If you have any questions about this information or consultation, please contact us now! Our Company: Nanchang 星枫 Instrument Co., Ltd. (www.xingfengyiqi.com) Contact: Zhengjing, or click on "Business League call" direct dialogue with us!