All models include these features . Extra large selector switch . Extra large, clear display for easier operation in outdoor conditions . Simple one button operation . Battery powered with a bar graph that updates battery strength . Noise reduction up to 40V peak to peak . Safety rating of CAT IV 100V . IP54 rated (water/dust ingress) for extra protection in harsh conditions Each instrument includes everything you need to test: Comes complete with test leads, stakes, batteries, calibration certificate and rugged polypropylene carry case.