PZEM-004T Small AC Voltmeter Single-Phase Frequency Current Watt KWH Meter TTL Modbus Electric Energy Coil CT Energy Meters.
 
The PZEM-004T (specifically V3.0) is a compact, accurate single-phase AC multifunction power monitoring module that measures voltage (80-260V), current (up to 100A via external CT), active power, energy, frequency, and power factor. It uses TTL serial (Modbus RTU protocol) to communicate with microcontrollers like Arduino, ESP32, and ESP8266
 
Key attributes
Phase: Single Phase
Output Voltage: 220V
Accuracy Class: 1.0
Max. Current: 100 A
Rated Current: 0.05 A～100 A
Measuring Energy Range: 0-9999kwh
Model Number: PZEM-004T
Type: Energy Digital Kwh Meter
Communication: TTL port
voltage test range: 80-260V
power test range: 0-22kw
Application: Electric Power
Product name
Single Phase Electronic KWh Meter
Frequency: 45~65Hz
 
Typical Applications:
IoT-based energy monitoring (Smart Home)
AC power monitoring
Prepaid energy meter projects
 
Resources: 
1. PZEM-004T-v30: Arduino library for the Updated ...
2. PZEM-004T V3.0 User Manual