Feature: 1. It adopts for chip, equipped with GPS positioning system, with precise measurement, small error and high . 2. VI level anti-skid design, using professional ergonomic design, not easy to fall off when working. 3. Waterproof, dustproof, fall proof, stable performance, no need to worry about machine falling when measuring mountain forest and fish pond. 4. Equipped with LED backlight display, the measurement results can be displayed on the screen directly, convenient for observation. 5. It supports full screen display of real-time track, which can display navigation and positioning information such as real-time accuracy, latitude, altitude, etc., and real-time restore of walking track with GPS positioning data, which can be displayed directly on full screen. 6. It supports manual fixed-point measurement, length and width measurement, airborne measurement and distance measurement. The measurement method is simple and easy to operate. Specification: Condition: 100% Item Type: Land Area Meter Material: ABS Model: EM90 Panel: FSTN 2.4in, Resolution 128x160 Area Measurement Range: 0-99999 Hectares Length Measurement Range: 0-99999999m Relative Accuracy Of Area: <= 2% Less than 3 Hectares, <= 1% More than 3 Hectares Track Tolerance: ±2m Environment: Temperature -20-60°C, Humidity 5%-95% Satellite Accuracy: ≤1.5m Measurement Error: 0.01mu Approx. 6.67㎡ Storage Record: 50 Built-In Battery: 3.7V 2500mAh Lithium Battery Weight: Approx. 370g / 13.1oz Product Size: Approx. 14x6x3cm / 5.5x2.4x1.2in Package List: 1 x Land Area Meter 1 x Portable Rope 1 x USB Cable 1 x Adapter 1 x Instruction Manual