By the transmitter, resistance signal of thermal resistance can convert into 4-20 mA current signal, convenient to use with the computer. Sensor:Pt100 Measuring range: -50 to 100 degrees Output: 4-20MA Operating voltage: DC 24V Accuracy: plus or minus 0.2% Due to different batches, the colors of the silk screen parameters on the products are random and cannot be specified. Colour: Blue Material: Plastic+Metal Size: 45mm diameter(1.77inch) Package Contents: 2 x Temperature Transmitter 4 x screws 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.