Features:
The tachometer uses for noncontact measurement of rotation speed (RPM) or contact measurement of rotation speed (RPM), surface speed (m/min).
Wide measuring range and high resolution.
Large screen LCD display provides clear reading.
White back light guarantee reading in any light environment.
Automatically save Max, Min and last value, also save 96 set of continuous data.
Low battery voltage indication.
Easy switch between contact and photo mode.
Surface speed wheel with groove to test surface speed or length of wire, cable, or rope conveniently.
Smooth housing design, comfortable to hold and use.
The instrument is delicate and rugged. It uses the durable, long-lasting components and a strong, lightweight ABS plastic housing.

Specifications:
Model: SM6236E
Display: 5 digits 18mm backlight LCD
Range:
◆ Photo mode
2.5 ~ 99999RPM
◆ Contact mode
0.5 ~ 19999RPM
0.05 ~ 1999.9m/min
Resolution:
◆ Photo Rotation Speed
0.1RPM (0.5 ~ 999.9RPM)
1RPM (over 1000RPM)
◆ Contact Rotation Speed
0.1RPM (0.5 ~ 999.9RPM)
1RPM (over 1000RPM)
◆ Surface Speed
0.01m/min (0.05 ~ 99.99m/min)
0.1m/min (over 100m/min)
Accuracy: ±(0.05%+1 digit)
Sampling Time: 0.8 second (over 60RPM)
Range Selection: Auto-switch
Time Base: 6MHz quartz crystal
Detecting Distance: 50 ~ 500mm (Photo mode)
Power: 3 x1.5V AA Batteries (NOT included)
Dimension: 155*70*35mm

Package List:
1 * Tachometer
1 * User Manual
3 * Reflective Paper
1 * Screw
4 * Tach-Accessories
1 * Photoelectric-Tach-Head
1 * Storage Case