18-90N	Digital Planimeters
	Features an LCD 8-digit display and ± 0.2% accuracy (within ± 2/1000 pulses). Maximum accumulated measuring value is 10m2(scale 1:1) Power is supplied by a built-in rechargeable Ni-Cad battery. 15 hour charge time provides approximately 30 hours of continuous operation; or choose AC 100V, 220V, or 240V using the AC adapter with automatic power-off function. Includes AC adapter/battery charger and plastic case.
18-80N	Polar type with computing function
18-90N	Roller type with computing function