The HT9021 is designed for measuring AC/DC current up to 1000 A in RMS value, achieving CAT IV 600 V and CAT III 1000 V safety standards according to IEC/EN61010-1. The clamp meter features a display with 6000 measurement points, backlight, and a histogram for easy reading even in low-light conditions. It also measures voltage up to 1000 V, resistance, frequency, capacitance, and temperature using a K-type probe.