bids are invited for digital earth resistance tester - the meter is applicable to the testing of the earth resistance of the power supply wires, distribution wires inside a room, electrical equipment or appliance, which can done in two measurement modes: bi-poles or tri-poles, and it also can be used to measure the earth voltage.large digital lcd and backlights applied to the meter facilitate users to read the information on lcd. besides, the meter is capable of storing up to 100 groups of measurement data, which will not be lost even in case of power cuts so that the user can easily consult the historical data. in addition, the meter can also be used to measure maximum, minimum or average and measure relatively. auto power-off function has been provided for it.technical specification • air temperature: 23+-5 degree celsius, relative humidity: <75 percent• range specifications• earth ground resistance: range: 10o, precision: ±(1 percent rdg+3d)• range: 4000o, precision: ±(4 percent rdg +4d)• earth voltage: range: ac50v(50 or 60hz), precision: ±(2 percent rdg +4d)• measurement method: constant current conversion is used for the measurement of earth resistance, with the frequency of the testing current about 800hz and the size about 3ma. average rectification is used for the measurement of earth voltage• temperature and humidity for measurement 0~45 degree celsius ,relative humidity under 85 percent • temperature and humidity for keeping the meter -10~50 degree celsius, relative humidity under 85 percent• supplied accessories: 3 test leads (one 15-meter-long red lead, one 10-meter-long green lead and one 5-meter-long black lead), 2 auxiliary earth bars• certificate: ce(emc+lvd) etl cat iii 300v rohs• auto ranging• auto power off• segments bar graph• max or min or avg• continuity test• relative measurement• data logging: 99 groups• display backlight• low battery display , digital micrometer - digitalmicrometerproduct descriptionmolding type:digital o/s micrometerrange