Use 0.02% professional table comparison calibration. To for the accuracy and consistency of each unit. Test standard 1 milliohm: display 0.9mR1.0mR1.1mR three situations. Most likely it display 1.0mR Test standard 10 milliohm: display 9.9mR 10.0mR10.1mR three situations. Most likely it display 10.0mR Test standard 1 ohm: display 999.9mR1000.0mR 1000.1mR three situations. Most likely to display 1000.0mR Part name: YHXY-002R resistance tester. Model: YHXY-002R. Size: 62.8 x 39 x 13.8MM. Range: 0.1 milliohms-20 ohms (automatic range) Display mode: LCD display Operation way: the power button for 1S to turn on and off. When powered on: Automatically shut down after 160 seconds without operation, once within 1S to switch the display font. twice within 1S to switch the background display style, 3 times within 1S to display the temperature, 4 times within 1S to enter the normal power-on mode, until The battery is lower than 10% and the power turns off automatically Charging indication: Automatically turn on when charging (turn off when fully ) Accuracy: +-(0.03% reading + 1 word) Open circuit output voltage: Less than 3.3V DC Resolution: 0.1 milliohms Test current: 25.3mA Display unit-mR (milliohms) Charging port input voltage: TYPE-C 5V 1A Charging current: 0.2A Power supply: 3.7V 230mAH Test line length: 50CM four-wire test clip Product accessories: four-wire Kelvin test Wide range and high accuracy: 0.1 mR-20R Resolution: 0.1 mR4-wire Kelvin test Ultra-small size, easy to carry, LCD screen display is clearer and more intuitive Uses 24-bit ADC chip Built-in lithium battery with long standby time (continuous use 3.5 hours) Color: As Shown Material: plastic Package Contents: 1 * host 1 * test clip 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.