Advanced Functionality: The MESTEK DM91A is a feature-rich digital multimeter designed for professional use, providing accurate readings in various electrical applications Versatile Measurements: Measure DC and AC voltage up to 600V, DC and AC current up to 10A, resistance up to 99.99MΩ, and capacitance up to 99.99mF, offering a wide range of testing capabilities User-Friendly Design: With a manual/auto-ranging feature, automatic recognition of buzzer/diode testing, and data hold function, the DM91A ensures efficiency and ease of use Enhanced Safety Features: Equipped with Non-Contact Voltage (NCV) detection, live wire identification, VFC AC voltage and current frequency measurement, and fuse fuse-break alarm, prioritizing user safety Convenient and Portable: The digital display with a maximum count of 1999, backlight for low-light conditions, and auto-shutoff after approximately 10 minutes of inactivity make it a reliable and portable tool Specifications: Display count (MAX): 1999 AC and DC voltage (V): 0~600V DC current (A): 0~600mA/0~10A AC current (A): 0~600mA/0~10A Resistance (Ω): 0~99.99ΜΩ Capacitance (F): 0~99.99mF Manual/auto range: manual Buzzer/diode: automatic recognition Battery voltage measurement: 1.5V/9V NCV: Yes Illumination backlight: Yes Automatic shutdown: Yes (about 10 minutes) Data retention: Yes True valid value: Yes LIVE FireWire Identification: Yes VFC AC voltage and current frequency measurement: Yes Fuse blown alarm: Yes Powered by battery: 2 x 1.5V AAA batteries, not included