⁺PZEM‑026 AC 40‑400V 100A Dual Digital Voltage Ampere Panel Meter Ammeter
Display format: when <10A, display such as 1.00A; when <100A, display such as 10.0A; when ≥100A, display such as 100A. Step 1: Long press the button (about 3 seconds) until the numbers on the screen start to flash, then release the button.