Check-Line CDT-2000HD Combination Contact and LED Photo Tachometer

Measuring Ranges: RPM 1.00 - 99,999 rpm Resolution: .01 from 0 - 100 .1 from 100 - 1,000 1 from 1000 - 99,999 Accuracy: ± 0.02% of reading or ± 1 digit Display: 5-Digit LCD, 10mm high Decimal Point: Automatic Memory System: Maximum, minimum, last and average reading (retained in memory for the life of batteries) Measurement System: Visible LED light beam, or contact adapter Engineering units: RPM Feet/min, inches/min and meters/min Feet, inches, meters Sensing Distance: Up to 24 inches (60 cm) Display Update Time: 0.5 seconds Auto Power Off: After 30 seconds of non-use (minimum, maximum, last and average reading retained in memory) Battery Life: 40 hours continuous use, approx. Battery Type: 2 AA (1.5V) or rechargeable Weight: 6 ounces (170 grams) Housing Material: ABS Plastic Operating Temperature: 32 to 122° F (0 to 50° C) Storage Temperature: -4 to 150° F (-20 to 70° C) Accessories Included: Reflective tape, 2 AA batteries, NIST-traceable calibration certificate and operating instructions in a foam-fitted, hard-plastic carrying case Warranty 5 years Measuring Ranges RPM Optical 1 - 99,999 rpm Mechanical 1 - 99,999 rpm Speed  6" Wheel 0.10-1524 m/min 0.40-5000 ft/min 4.0-60.00 in/min 0.10-25.40 m/sec 0.10-83.33 ft/sec 12" Wheel 0.40-609.6 m/min 0.40-2000 ft/min 4.00-24.000 in/min 0.10-10.16 m/sec 0.10-33.33 ft/sec 0.1 m Wheel 0.10-1999 m/min 0.40-6550 ft/min 4.00-78.700 in/min 0.10-33.30 m/sec 0.10-109 ft/sec Length 0 - 99,999 m 0 - 99,999 ft  0 - 99,999 in