SM8124 battery internal resistance voltmeter voltmeter to measure battery internal resistance of the battery terminal voltage and internal resistance of two basic parameters. Resistance measurement using the international standard AC signal: 1000Hz ± 10% were measured, and the use of the "four-wire" measuring resistance, avoiding the time-line measurement of the measurement instrument test probes and leads with battery output terminal contact resistance impact. And while measuring the battery voltage. For a variety of single and combination battery internal resistance measuring lithium ion, nickel metal hydride, lithium manganese, lead-acid and so on. 3 1/2 LCD display, character height 18mm Voltage measuring range: 0 ~ 1.999V, 2 ~ 19.99V, 20 ~ 199.9V voltage resolution: (0 ~ 1.999V) 1mV (2 ~ 19.99V) 10mV (20 ~ 100V) 100mV resistance measurement range: 0 ~ 199.9mΩ, 200 ~ 1,999 mΩ, 2 ~ 19.99Ω resistance Resolution: (0 ~ 199.9mΩ) 0.1mΩ (200 ~ 1,999 mΩ) 1mΩ (2 ~ 19.99Ω) 10mΩ Operating Temperature: -10 ~ 40 ° C