Increase disposable fast blow to avoid false instrument damage caused by 220V plug. All functions all use internal electronic input and output has a corresponding button. Two connector terminals can be used regardless of input and output. It is easy to operate. In addition to having a conventional input and output functions,resistance, PT100.Cu50 RTD, thermocouple eight kinds of signals can be input and output, measure negative temperature. The sensitivity of thermal resistance and resistance to external excitation output current is reduced. Increase the output and the measurement accuracy. For both constant and non-constant resistance measurement , expanding the usage of the instrument. V, Ω input and output has a corresponding button, directly call without advance menu, no combination of keys. and high quality Model: LB02 Current Output: 0-24 V Output:0-11 V Output: 0-110 Resistance Output:20-4000Ω Current Measurement V Measurement Measurement Resistance Measurement Colour:As Shown Material:plastic Package Contents: 1 x LB02 Calibrator 1 x Test Pen 1 x USB cable 1 x Carrying Box 1 x English User Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.