Battery Efficiency: Designed for extended use in field applications, the -250K does not include a battery, allowing users to choose high-capacity options suitable for prolonged diagnostics and educational purposes. Safe and Chemical-Free: The -250K is constructed without the use of high-concern chemicals, ensuring safety and environmental friendliness, ideal for educational environments and sensitive electronic testing. and Clarity: Features a 2.8-inch LCD with a resolution of 320*240 pixels, providing clear and precise visual feedback, essential for detailed electrical measurements and educational demonstrations. Versatile Measurement Range: Capable of handling input voltages up to ±40V, this oscilloscope is perfect for a wide range of electrical testing requirements, from low-voltage electronics to moderate industrial applications. Compact and Portable: With its small size and design, the -250K oscilloscope is ideal for both DIY enthusiasts and professionals who require a reliable tool for on-the-go measurements and repairs. Specifications: Bandwidth: 250kHz Real-Time Sampling Rate: 2.5MS/s Voltage Range: ±40V (X1 Probe), ±400V (X10 Probe) Display: 2.8" LCD, 320x240 resolution Battery: 400mAh Li-ion, 3 hours runtime Trigger Modes: Auto/Single/Normal, Edge Selectable Probe Coupling: Dimensions: 103x73x25mm Weight: 100g Calibration: 1kHz, 3Vpp Square Wave Output Wide Voltage Range & X1/X10 Probe Modes: Safely measure high-voltage circuits and match probe settings to avoid measurement errors. Color: Blue Material: plastic Package Contents: 1*Digital Oscilloscope Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.