1、[Backlight Display] Large screen high definition backlight display, unit symbols display, clear numbers without ghosting, easy to understand, easy to operate in dark environments. 2、[Shockproof Protective Cover] This digital multimeter is designed with shockproof protective cover, double protection, more secure, more assured to use, and worry free measurement. 3、[Simple To Use] The back of the multimeter is designed with a bracket, which is convenient to place and easy to observe the data, so you can use it with confidence. 4、[Test Lead Storage Design] Digital multimeter protective cover has a test lead storage design on the back, which is easy to carry the test lead and measure. 5、[Multifunctional] Can measure AC and DC voltage, AC and DC current, resistance, capacitance, inductance, diode, triode on‑off test, temperature and frequency. Item Type: Digital Multimeter Model: LD9817B Material: ABS Battery: 2 x AAA 1.5V (Battery Not Included) 600V CAT.III and 1000V CAT.II Pollution Level: 2 Altitude: <2000m Working Environment Temperature And Humidity: 0-40℃, <80%RH, not considered when <10℃) Storage Environment Temperature And Humidity: -10℃-60°C (<70%RH, remove the battery) Temperature Coefficient: 0.1 x accuracy/°C (<18°C or >28°C) Fuse Protection: uA And mA Files: Self recovery fuse Sampling Rate: About 3 times/second Display: 3 3/4 digit LCD display. The unit symbols is automatically displayed according to the measurement function gear Range Switching Mode: Automatic and manual Over Range Indication: LCD will show "OL" Input Polarity Indication: "-" sign is displayed automatically Accuracy Index: 2. Frequency: 50.00Hz/500.0Hz/5.000kHz/50kHz/100kHz 3. Resistance: 400.0Ω/4.000kΩ/40.00kΩ/400.0kΩ/4.000MΩ/40.00MΩ 4. Current: DC Current: 400uA/4000uA DC Current: 40mA/400mA DC Current: 4A/10A AC Current: 400uA/4000uA AC Current: 40mA/400mA AC Current: 4A/10A How to Use: Normal Operation: Reading Hold Mode/Backlight Control Keys: The reading hold mode can keep the current reading on the display. Activating the reading hold function in the automatic range mode will switch the meter to the manual measurement mode, but the original range will remain unchanged. The reading hold mode can be exited by changing the measurement function gear, pressing the RANGE key or pressing the HOLD key again. To enter and exit reading hold mode: 1. Press the "HOLD" key once, the reading will be held and the "DATA‑H" symbols will be displayed on the LCD at the same time. 2. Press the "HOLD" key again to restore the meter to the normal measurement state. (There is no "HOLD" function during frequency measurement.) 3. Backlight display: In "HOLD" mode, press the "HOLD" key for more than 2 seconds to turn on the backlight, and when the backlight is on, press the "HOLD" key for more than 2 seconds, the backlight is turned off (only LD9807B, LD9817B). 1. In auto ranging mode, the meter selects the best range for the detected input. This allows you to switch test points without re ranging. 2. In manual range mode, you need to select the desired range yourself. This allows you to override autoranging and lock the meter at the specified range. 3. For measurement functions with more than one range, the meter will use auto‑ranging mode as its default mode. When the meter is in auto range mode, the display will show the "AUTO" symbols. To enter and exit manual ranging mode: 1. Press the "RANGE" key. The meter enters manual range mode and the "AUTO" symbols disappears. Each time the RANGE key is pressed, the range will increase by one step. When the highest gear is reached, the meter will cycle to the lowest gear. NOTE: After you enter the reading hold mode, if you manually change the range, the meter will exit the mode. 2. To exit manual ranging mode, press and hold the "RANGE" key for two seconds. The meter returns to autoranging mode and the display shows the "AUTO" symbols. 1 x Multimeter (Battery Not Included) 2 x Test Lead 1 x Temperature Probe 1 x Manual