This product is discontinued / Replaced by SE-2500A Gasoline Engine Tachometer (Click here)





SE-2500 is a handheld tachometer by non-contact method, which the detection, measurement and displaying portion are combined with built-in batteries and is designed to measure the revolution of the gasoline engine exclusively.
By closing the detector (head position) to the ignition coil, the engine revolution can be measured at the unit of 1 r/min or 0.01 r/s. Further, remote measurement is possible by using the IP-2800 detector which is provided as standard accessory. The max. 20 measurement data can be stored internally by memory function which is convenient for later checking.

Both analogue (which can be switched over to monitor also) and pulse output function are provided as standard. Analogue output signal can be used for the recording the signal from data recorder and so on. Monitoring output signal can be used for checking the sensor’s detection waveform or as the input signal by FFT analyzer. Pulse output signal can be used as external clock signal for tracking analysis by FFT analyzer.

IP-2800 External Sensor (Accessory)


  • Built-in memory function 20 data (MAX) can be saved to memory.

  • Three outputs—analog, monitor and pulse—provided as standard

    Use the analog output function to record the number of rotations, the monitor output function to check the sensor’s detection waveform, and the pulse output function to output rotation synchronization signals.
  • Large LCD with backlight

    (Character height: 10.2 mm)
  • Capable of performing measurement at a distance of 1 m when the external sensor (IP-2800) is used.*

  • Can be mounted on a tripod

    The tachometer can be fixed to a tripod for continuous measurement.
  • Measurement can be performed in 1 r/min or 0.01 r/s units.

*Measurement is impossible depending on the type of the engine.

Measurement method


Specifications Summary


Applicable engines Gasoline engines
2-cycle (1, 2, 3, 4 cylinders),  4-cycle (1, 2, 3, 4, 5, 6, 7, 8, 10, 12 cylinders)
Detection method Electromagnetic induction
Detection distance 10 to 200 mm
Object of measurement Ignition coil
Calculation method Cycle calculation method
Measurement time Within 1 s + the time required for one cycle
Display 5-digit LCD, with backlight (character height: 10.2 mm)
Display update time 1 ±0.2 s
Measurement units r/min, r/s
Measurement ranges  
2-cycle 4-cycle Number of rotations (r/min)
- 1 cylinder

120 to 20000r/min

1cylinder 2 cylinders

120 to 20000r/min

- 3 cylinders

120 to 20000r/min

2 cylinders 4 cylinders

120 to 20000r/min

- 5 cylinders

120 to 20000r/min

3 cylinders 6 cylinders

120 to 15000r/min

4 cylinders 8 cylinders

120 to 12000r/min

- 10 cylinders

120 to 10000r/min

- 12 cylinders 120 to 8000r/min
(r/s is the numerical value obtained when the r/min measurement value is divided by 60)
Measurement accuracy Displayed value* x (±0.02%) ±1 count
* The displayed value is the count value excluding figures after the decimal point.
Memory function 20 data (MAX)
Over-range function The over-range alarm (ERROR mark) is displayed when the measured value exceeds the display range.
Rotation upper limit alarm function The upper limit alarm ( mark) is displayed when the number of rotations exceeds the preset upper limit value.
Sensitivity adjustment function A rotary dial at the right-hand side of the device is used to adjust the sensitivity.
Analog output Output with respect to the displayed rotation values

Output voltage: 0 to 1 V/0 to FS (FS is freely selectable)
Conversion method: 10-bit D/A conversion
Linearity: ±1%/FS
Output update time: Within 50 ms + the time required for 1 cycle
Temperature stability: ±0.05%/FS/°C (span & zero)
Setting error: ±0.5%/FS
Load resistance: At least 100 kΩ

Monitor output Analog output for monitoring purposes after waveform reshaping of the sensor signal

Load resistance: At least 100 kΩ

Pulse output 1 pulse output per signal detection

Output voltage: Hi level: At least +4.5, Lo level: Up to +0.5 V
Output logic: Positive logic
Load resistance: At least 100 kΩ

Power source Four AAA alkaline batteries or exclusive AC adapter (PB-7090, Option)
Battery life At least 32 hours (when the backlight is OFF)
At least 8 hours (when the backlight is ON)
Low battery alarm indicator A low battery alarm (LOW mark) is displayed when the battery voltage falls below 4.4 V.
Operating temperature range 0 to 40°C
Storage temperature range -10 to 50°C
Outer dimensions 198.5 (W) x 47.5 (H) x 66 (D) mm
Weight Approx. 300 g (including batteries)
Accessories Ignition detector (IP-2800) , AAA alkaline batteries × 4, Carrying case


LA-0203A Tripod HT-0522/0521A Magnetic stand/Stand jig PB-7090 AC adapter




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