90V 20A Digital Voltmeter Ammeter Voltage Meter With Color DisplayHere is the manual!!!I. Introduction instrument:Voltage meter is able to measure voltage、 current、 charge and discharge capacity、 time、 power and other physical quantities of the new voltage meter、 but also can set parameters to achieve over voltage protection、 under voltage protection、 over current protection、 over-charging capacity protection features protection and limit protection.The instrument uses a color liquid crystal display measured data、 display information comprehensive and humane. This instrument is ideal for monitoring the output voltage and current、 as well as the battery charge and discharge applications.2. The main characteristics:1. Two-way detection current for detecting the charging and discharging of the user can easily detect bidirectional current、    Without changing the wiring.2. Power and memory function、 power failure after the number of memory before power can be AH、 facilitate the observation and measurement.3. Time and number of AH clear function、 without affecting the measurement.4. AH number can fill、 does not affect the direct discharge measurement.5. Voltage、 current、 charge capacity AH number、 WH number、 time、 power is simultaneously displayed、 the display information comprehensive and clear.6. With an output shutdown function keys、 flexible output turned on or off.7. Over-voltage、 over-current、 over-power、 limit、 overcharge protection.8. Online calibration、 enabling customers to promptly correct the error.9. In the liquid crystal display can be turned off if necessary、 reduce power consumption.Key Introduction:Package included:1 x 90V 20A Digital Voltmeter Ammeter