Temperature Data Logger to PC 4 Channel RS-232 DS18B20 [ No Sensor version ] Log temperarue data -55 to 125'C via RS232 4 Input for Digital sensor DS18B20 / Log rate 1.2s, 5s, 15s and 30s / Select 'C or 'F by jumper on board No Driver and power supply needed PCB size : 4.5cm x 5.8cm