4x Digital LED Tachometer RPM Speed Meters Suitable For Hall Proximity Switch Sensor NPN Set

Features:
Four-digit Reading
The digital panel meter adopts the latest A/D conversion chip and high-stability reference IC, with a reasonable circuit design.
Can measure voltage and current, or connect with external sensors to measure temperature, pressure, displacement, etc.
Suitable for display of various digital instruments.
Good stability, high measurement accuracy, strong anti-interference ability.
Standard exterior size, easy to install.

Specifications:
Brand: MAXCOOL
Measurement accuracy: ±0.1%, reading 1 word
Display mode: 0.56" blue LED
Display refresh rate: >3 times/sec
Working power: AC/DC 8-24V, 40mA
External dimensions: 79 × 42 × 32mm
Installation size: 76 × 39mm
Weight: approx. 50g
Over-range display: first digit shows "1" or "-1", last three digits blank
Input pulse signal: NPN/PNP open collector, contact switch, non-contact switch, level pulse
Input signal voltage: Low -30V~0.6V, High 4-30V
Measurement range: Speed 10-9999 RPM

Precautions for use:
1. Connect the plug correctly according to wiring requirements.
2. Avoid strong electromagnetic interference; use shielded or twisted wires for measurement.
3. Keep the counter signal close to the terminal to shorten the signal line.
4. Avoid routing near strong electric or power wires; use shielded wires if necessary.
5. Mechanical or micro switches are not recommended; if used, choose high-quality switches or magnetic switches to avoid counting errors.

Package Include:
1 × Blue LED Tachometer
1 × Hall Proximity Switch Sensor NPN
1 × Bracket

Note:
Please allow slight 1-2cm difference due to manual measurement and minor color variation due to different display settings.