What is the difference between X1 and X2? X2 is 4 in 1 design, infrared thermometer+voltage tester+multimeter+flashlight X1 is 3 in 1 design, voltage tester+multimeter+flashlight BSIDE X2 Upgrade Digital Multimeter 4-in-1 Infrared Thermometer Non-Contact Voltage Tester Color Analog Bar EBTN with Flashlight [Integrated Infrared Thermometer]: Voltage detector integrated infrared thermometer greatly enhance the test experience, ideal for HVAC applications, automotive, grill, etc. [Color LCD Display]: BSIDE color LCD display greatly enhance the reading experience, the lighted up numbers &letters with black background make it very easy to read, even in bright sunlight or poor light. [8 LED Indicators]: 8 LED Indicators in 3 color make it very easy to judge the detected voltage strength. [Integrated Multimeter]: Voltage detector integrated multimeter design not only greatly expands the testing applications, but also let you not worry the multimeter consume too much space. X2 Specifications: Display: 2000 counts DC Voltage: 500V 0.01V (0.8%+3) AC Voltage: 500V 0.01V (1.2%+5) Resistance: 10M 1 (1.2%+3) Frequency: 1000Hz 1Hz (2.0%+3) Temperature: 0-380(2.5%+2); -20-0(2.5%+3); -4-716 Continuity: If the resistance le than 30, the beeper sounds V-Alert (Non-contact Voltage Detection): Yes Power: 1.5V AAA x 2 (not included) Size: 181*31*28mm Weight: 87g Package Includes: 1 x X2 Voltage Detector 1 x Test Leads 1 x Case 1 x User Manual Note: The batteries are not included in the package due to Aviation Security Check. Sorry for any inconvenience caused. BSIDE X1 digital multimeter 3 in 1 non-contact voltage tester EBTN with flashlight 1.Non-contact and slim desigh, convenient to operate and carry. 2.EBTN super-clear display, clear and easy to read. 3.Dual mode operation.(Low sensitivity and High sensitivity) 4.With inductive dangerous voltage alarm, live/neutral line distinction, live break point positioning, continuity check, flashlight function, etc. 5.LCD Display &LED indicator dual prompts-Dangerous voltage at a glance. 6.With 8 LED indicators in 3 colors (Red/Yellow):Automatic identification of high/medium/low voltage. 7.Alarm mode: SoundAnalog strip and light (Red/Yellow). 8.Double insulation body material greatly improves the safety standard to protect you from electric shock. 9.Safety level: CAT II 600V. 10.Battery low voltage reminder, Auto power off features. X1 Specifications: Display: 2000 counts Screen: 2 inch DC Voltage: 500V 0.01V (0.8%+3) AC Voltage: 500V 0.01V (1.2%+5) Resistance: 10M 1 (1.2%+3) Frequency: 1000Hz 1Hz (2.0%+3) Continuity: If the resistance le than 30, the beeper sounds V-Alert (Non-contact Voltage Detection): Yes Power: 1.5V AAA x 2 (not included) Size: 160*31*28mm Weight: About 69g Package Includes: 1 x X1 Voltage Tester 1 x Test Leads 1 x English User Manual Note: The batteries are not included in the package due to Aviation Security Check. Sorry for any inconvenience caused. BSIDE Z5 Specifications: Display: 6000 counts Screen: 1.9 inch DC Voltage: 0.1V-600V 0.001V (0.8%+3) AC Voltage: 0.1V-600V 0.001V (1.2%+5) Resistance: 0.1-10M 0.1 (1.2%+3); 10M-60M 0.1 (2.0%+10) Capacitance: 1nF-1mF 0.001nF (3.5%+8); 1mF-60mF 0.001nF (4.5%+10) Frequency: 10Hz-10MHz 0.1Hz (2.0%+10) Diode: Measure diodes within 3V Continuity: If the resistance le than 50, the beeper soundsV-Alert (Non-contact Voltage Detection): Yes Live Wire Check: Yes Power: 1.5V (AAA) x 2 (not included) Size: 185*22*22mm Weight: 63g Package Includes: 1 x Pen Type Multimeter 1 x Test Lead 1 x Case 1 x Screwdriver 1 x User Manual