Red/Blue 4 Digital LED Tachometer RPM Speed Meter w/Hall Sensor NPN Hot

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It can be applied to the measurement of voltage, current and external sensor to measure temperature, pressure, displacement and other physical quantities. Suitable for all kinds of digital instrument display. Features: Good stability, high precision and strong anti-interference ability. The external appearance adopts standard size and convenient to install. Input pulse signal: NPN/PNP open collector ,contact switch, contactless switch, level pulse. Input signal voltage: low level: -30V -0.6 V, high level: 4-30V. Measuring range: frequency: 9999Hz, 999.9 HZ, 99.99 KHZ, automatic switching selection. Specifications: Measurement accuracy: ±0.1% Display mode: 0.56"LED Display refresh rate: >3 times/sec Working power supply: DC8-24V, 30mA, measurement range: 10-9999RPM Hall proximity switch : magnetic Appearance size: 80 x 42 x 25mm/3.14 x 1.65 x 0.98inch LED display(Optional): red, blue Weight: 80g(red),105g(blue) Overrange display: the first one shows "1" or "-1", and the latter three do not show Precautions: 1. Connect the plug correctly according to the wiring diagram 2. Should avoid strong electromagnetic interference and it is better to use shielded wire or double stranded wire for measuring conductors 3. The counting signal of the counter and the switch of the zero clearing signal input or the circuit shall be as close as possible to the terminal of the counter to make the signal line as short as possible 4. Avoid with other such as: high voltage wires or power wires and so on with same tube or twisted trace line, in order to avoid unnecessary interference.If necessary, please use the shielded wire, shielding layer connect the"+" of the count terminals 5. It is not recommended to use a mechanical switch or micro switch because they have a relatively short life span and can be counted by mistake after long time. If you use a mechanical switch or a micro switch, please try to use a better quality, so as not to miscount, and strongly suggest a magnetic control switch Package Included: 1 x Tachometer 1 x Hall NPN proximity sensor ● Payment We accept PayPal only. We only ship item to your PayPal verified address. Payment must be received within 3 days from the date of purchase. Orders will be processed instantly and dispatched in same day normally, so we do NOT accept any Email/Message note after you place orders. ● Terms of sales1. Our listing price includes the value of goods,packaging cost,and export taxes,not including international import duties. 2. Import duties,taxes,and charges are not included in the item price or shipping fee. 3. The import duties are buyers' responsibility.Please check with your country's customs office determine what these additional costs will be prior to your purchase. 4. All disputes arising from the import duties will be submitted to eCRATER for solution. ● FeedbackWe will always do our up most to exceed your expectations in customer service, communication and dispatching of your orders. ● Contact us Any questions, pls. contact us via eCRATER message or email us.We will reply your message within 48 hours. If you do not receive our reply within 48 hours, pls. post a message again because sometimes our message system may block some emails. If you are satisfied with our service, pls. kindly leave us a positive feedback and give us the Detailed Seller Rating with all "5 stars" in very area. Our aim is to provide Top Level Customer Service, your recognition will encourage us greatly and serve you better. We strive to keep all our customers satisfy. We greatly appreciate your POSITIVE feedback. Please do NOT leave negative feedback without asking for help.Thanks! On Nov-02-17 at 00:11:04 PDT, seller added the following information: