Enhance your speed measurement tasks with this versatile Digital Tachometer DT2236B, designed to deliver precise and reliable readings through dual measuring methods: contact and photoelectric non-contact. Whether you need to measure rotational speed or line speed, this tachometer offers exceptional accuracy and convenience for various industrial and mechanical applications. Key Features: · Dual Measuring Modes: Supports both contact and photoelectric non-contact measurements, allowing flexible and accurate speed detection for a wide range of objects and surfaces. · Multiple Contact Probes: Equipped with 4 different rubber contact wheels and probes to ensure close and precise contact with conveyor belts, gears, pulleys, and other rotating components. · Large LCD Display: Features a 5-digit large LCD screen with 18mm character height for clear, intuitive readings up to a maximum display of 99999, enabling easy data observation even in low-light conditions. · Wide Measurement Range & High Accuracy:  - Non-Contact Speed: 2.5 to 99999 rpm with 0.1 rpm resolution (2.5-9999.9 rpm) and 1 rpm resolution (above 1000 rpm)  - Contact Speed: 0.5 to 9999 rpm with 0.1 rpm resolution (0.5-999.9 rpm) and 1 rpm resolution (above 1000 rpm)  - Contact Line Speed: 0.05 to 9999 meters per minute with high resolution for precise surface speed measurement · Memory Function: Stores maximum, minimum, and final measured values, preventing data loss during low battery or accidental shutdowns. · Effective Measuring Distance: Laser sensor effective range from 50 to 500 mm and LED sensor from 50 to 250 mm, enabling flexible non-contact measurements at varying distances. · Wide Industrial Applications: Ideal for use in motor testing, fans, paper making, plastics, chemical fiber industries, washing machines, automotive, aerospace, and marine sectors. · User-Friendly Operation: Free conversion operation method simplifies switching between measuring modes, ensuring smooth and efficient use. · Low Battery Indication & Power Efficiency: Includes low battery warning and operates with a low current of 50mA for extended battery life (requires 4 x 1.5V AA batteries, not included). Specifications: · Model: DT2236B · Display: 5-digit large LCD, character height 18mm · Measurement Range:  - Non-Contact Speed: 2.5-99999 rpm  - Contact Speed: 0.5-9999 rpm  - Contact Line Speed (Metric): 0.05-9999 meters/minute · Resolution:  - Non-Contact Speed: 0.1 rpm / 1 rpm  - Contact Speed: 0.1 rpm / 1 rpm  - Contact Line Speed: 0.01 / 0.1 meters/minute · Accuracy: ±(0.05% + 1) · Sampling Rate: 0.8 seconds (above 60 rpm) · Effective Distance: Laser 50-500 mm, LED 50-250 mm · Power Supply: 4 x 1.5V AA batteries (not included) · Dimensions: Approx. 7.5 x 3.5 x 20 cm (3 x 1.4 x 7.9 in) This Digital Tachometer DT2236B combines precision, versatility, and ease of use, making it an essential instrument for professionals seeking accurate speed and line speed measurements across diverse industrial environments.