Resistivity Meter Input:0.01-400Ohm,0~50K Ohm Accuracy:0.3% data/peak value ... 4-20mA. DR series Resistivity Meter (0.01-100 Ohm)Features: 1, Input: 0.01-400Ω, 0--50KΩ, others set by user ... or 4-20mA, with output range adjusted by software.5, RS232 or RS485 Modbus RTU protocol, connectable with various equipment, computer ...