Digital Planimeter


Placom KP 90N Digital Planimeter

Placom Digital Planimeter KP-90N-Series with the most advanced functions and perfect reliability.

The most standard model of “Koizuimi Placom” N-Series has made the excitingly highest attainment in the history of Placom Digital Planimeter KP-90N ever made. Measuring capacity is remarkably enlarged. Measuring by 6-digit pulse count enables to measure 100 times larger accumulative area than ordinary planimeters. Easy calculations of Cumulative and Average Value Measurement.


·         Construction and civil engineering

·         Land developing planning, Machine designing

·         Datalanalysis in statistics

·         Architecture and interior designing

·         Forestry area, Ship designing

·         Medical research, Agriculture

Product Description

Key Features of Placom KP-90N Digital Planimeter

Measurement by 6 digit pulse count

This N-Series can measure the area by pulse count of 6-digits. This method enables a larger cumulative measurement of area (Up to 10m²)

Maximum cumulative measurement value of 10m²

With the measurement by 6-digit pulse count, the N-Series Planimeter can measure a larger area by 100 times than ordinary Planimeter.

The conventional planimeter has a maximum cumulative area to measure only 0.1m². If measurement value shows over 0.1m2 when measuring, the display is to be reset to “O”.

This requires to register the numbers of how many times these re-settings are occurred.

With the New PLACOM N-Series, there is no need of these troublesome procedures.

Easy conversion function of unit and scale

Placom KP-90N can convert easily the measured area value into a new area value in a newly desired unit and with a newly desired scale value.

Placom KP-92N and KP-82N can convert the unit between in² and cm²

Hold memory function

In cumulative measurement, this Hold Memory function is effectively used. If an error occurs in measuring, press C/AC key. Then last measured value is appeared by pulse count. Since previous measured values before error are stored, there is no need to another measurements from the beginning.

Automatic shifting of unit to upper unit

When the measured area value overflows the displayed figures of 8 digits, the measured area value is calculated and displayed by an upper unit. When the overflows is occurred in the uppermost unit, km², acre, the measurement can be continued by pulse count display.

Average value measurement

In order to get better result of measurement, Mean value measurement is recommended. This measurement can be easily done on this N-Series.

Measurement of an area with different lateral and longitudinal Scale.

Auto-power-off function for energy saving

Placom KP 90N Digital Map Measurer Technical Specifications:

Model Parameter






Roller Type

Polar Type

With Computing Function

Single Function

With Computing Function

Single Function


Liquid Crystal, 8-digit Figures

13 Symbols

6 Symbols

13 Symbols

6 Symbols


Memo, Hold
cm2, m2, km2, in2, ft2, acre etc.

Memo, Hold
cm2, in2, etc.

Memo, Hold
cm2, m2, km2, in2, ft2, acre etc.

Memo, Hold
cm2, in2, etc.

Converting Function

Unit and Scale value

Unit(in2, cm2)

Unit and Scale value

Unit(in2, cm2)

Accumulated Measuring Value

Maximum 10m2(Scale 1:1)

Measuring Range

Maximum vertical width: 325mm
Horizntal roller rotating length: 30m

Maximum, with the pole put outside the pattern: 300mm in diameter
Maximum, with the pole put inside the pattern: 800mm in diameter


Within +/-0.2%(Within +/-2/1000pluses)

Power Supply

·         Built-in NiCd Battery(rechargeable through AC Adapter)

·         AC Adapter 100-240V (Auto-power-off function is provided.)

Operating Duration

Approx. 30 hours of continuous operation

Battery Charging Time

Approx. 15 hours

Main Unit Weight




Supplied AC Adapter and Plastic Case



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