Fluke 190 series ii scopemeter portable oscilloscopes fluke fluke 190 104eus the fluke 190 104eus scopemeter 100mhz 4 channel portable oscilloscope has an ip51 dust and drip water proof rating and a cat iii 1000 vcat iv 600 v safety rating its input channels are fully isolated and insulated the scope meter has a waveform capture buffer of 10 000 samples per channel so you can zoom in on the details plus it automatically saves the last 100 screens for you to refer back to the connect