... accuracy class of the calibrated electric energy meter. 9. Measure CT variable ratio, ratio error, ... . Users can, according to demand, select clamp meter with 5A, 10A, 100A, 200A, 500A, 1000A, ... function is available. Electric energy meter on-site counter test, register error and calibration constant ... 250000 as hand constant.9. Temperature coefficient: 5ppm.10. Low voltage input impedance: >750KΩ. 11. ...