HTM 890 Photo Contact Digital Tachometer

Model Number – HTM 890

It typically consists of a display unit, a light source, a photo sensor, and a rotating object or wheel. The HTM 890 Photo Contact Digital Tachometer is a highly accurate and reliable instrument designed for measuring rotational speed in mechanical and industrial applications. This tachometer features a large, easy-to-read LED display and a wide range of selectable measurement units. The HTM 890 also features a self-calibrating system that helps to ensure accurate measurements and a wide range of digital output options, including a serial port and a USB port. This tachometer is suitable for monitoring a variety of rotating machinery such as motors, pumps, compressors, blowers, and fans. It is also capable of storing up to 99 readings for comparison and troubleshooting purposes.

Also Available at


Original price was: ₹3,720.00.Current price is: ₹3,200.00.

Shipping Timing: 2-5 Business Days.

Key Features

Used in industrial applications to monitor the performance of motors.

  • Full Digital, Micro Controller LSI circuit design for high reliability and versatility
  • Comes with a sturdy, easy to carry/handle carrying case box with foam padding for protection against impact.
  • Ergonomically designed for handheld based operations for risk free RPM measurement at all times.
  • Excellent Quality, compact size and accurate reading.
  • Economic and effective Battery power utilization


Technical Specifications


Ranges 60 RPM – 50,000 RPM (contact side)
6 m/min – 5000 m/min (surface speed)
60 RPM – 1,00,000 RPM (photo side)
Resolution 0.1 RPM: 0 – 1000 RPM | 1 RPM: > 1000 RPM
0.01 : 0 – 100 meter/min | 0.1 : > 100 meter/min
Display Type 5 DIGITS 10mm(0.38”) height RED LED
Accuracy + 0.05% + 1 Digit
Sampling Rate 1 second
Time Base Quartz Crystal Controlled
Measuring Distance 75mm (3 inch) to 300mm (12 inch) (Photo side)
Low Battery Indicated by “Lobat” when the battery
voltage drops below operating voltage
Memory Recall ‘Last’, ‘Max’, ‘Min’ Values memorized automatically, upto 120sec can be recalled
Power Source 4 X 1.5V AA Battery. Auto Shut off feature included
Battery Life 90hrs for alkaline batteries (contact side)
30hrs for Carbon-Zinc batteries (contact side)
24hrs for alkaline batteries (Photo side)
12hrs for Carbon-Zinc batteries (Photo side)
Operating Temperature 0° Celsius to 60° Celsius (32° F to 140° F )
Size 70 x 200 x 40mm (2.8 x 7.8 x 1.6 inch)
Weight 320grams including battery
Standard Accessories Male rubber contact tip– 2nos
Female rubber contact tip– 2nos
Peripheral rubber contact tip– 1nos
Reflective tape (Marks) 1000x12mm(40×0.5 inch)–1nos
Padded Carrying Case–1nos User Manual– 1nos


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