Fluke 87-V Digital Multimeter Accurate frequency measurements on adjustable speed drives (ASD) due to Fluke-designed low-pass filter Built-in thermometer allows temperature measurements without a separate thermometer Peak Min/Max allows capture of intermittents as fast 250 S Dual display resolution  6000 or 20,000 counts  lets you see small changes in displayed readings.CAT III 1000V, CAT IV 600V safety rated Measure up to 1000 VAC and DC