DT-T73 4 inch Engineering Tester Video Surveillance Tester 1. Compact design, single-handed operation 2. Large capacity lithium battery, easy replacement, more convenient 3. High quality cables, stable and reliable communication 4. Supports NTSCPALCVIAHDTVI signals, six resolution frame options of 720P1080P 5. Can be used as a high-precision, full-function digital multimeter, with accurate measurement and convenient use 6. Support Chinese and English language modes Function: 1. Network camera image test: Supports H.264, H.265, 4K main stream testing 2. Activation of Hikvision cameras 3. Activation of Dahua cameras 4. IP address search and detection, Ping IP 5. Enhance compatibility of ONVIF cameras, discover IP addresses across network segments 6. Voltage and power test, instantly grasp power supply situation 7. Network speed: has icon prompts when the line is abnormal, can always monitor the entire Ethernet connection status 8. Test backbone traffic, master the entire data flow situation 9. Can call for image zoom preview (8-level zoom) 10. Dual network ports support 101001000M, network status and traffic display, supports concatenation 11. Upgrade coaxial high-definition: HD-CVI; HD-TVI: HD-AHD 12. Simulation camera test; audio test 13. Camera power supply: POE power supply, 12V2A output 15. Pan-tilt test: coaxial pan-tilt control test, 485 pan-tilt test, network dome camera test 16. TDR network cable fault point test: network cable quality test, measuring the maximum cable length of 130-200 meters (depending on the cable material) 17. Battery: special replaceable 7.4V polymer lithium battery, capacity 22.2Wh, equivalent to 6000mAh, working time approximately 10 hours 18. Display screen: 4.0 inch high-definition resolution, clearer and smoother picture 19. LED lighting: 35lm LED two pieces, diffuse light 20. Storage function: built-in 8G memory card, capable of taking screenshots, recording videos, and can save evidence for