What is the difference between the FROG-4000™ and the FROG-5000™?
FEATURE FROG-5000™ FROG-4000™ VOC Detection in Air, Water or Soil Included Software Highly Portable Scrubs Ambient Air for Carrier Gas Battery Lithium Ion* Nickel Metal Hydride Battery Life 9 hours 6 hours Battery-Life Indicator Built-In Battery