The Courier Series offers an 8-digit, high-visibility LCD display, optional backlighting, a replaceable lithium battery as well as front panel reset and a remote reset terminal. Its a 1/Tau ratemeter with scaling capabilities. Various input options are available. The Eclipse Series of tachometers/ratemeters offers a 5-digit, high-visibility LED interface, front panel programming, and various input options. Memory will store up to 100 years of data and does not require batteries. Intended for indoor use to 2000 meters. The Ambassador Series is the most noise-immune ratemeter. Meters are AC/DC powered and offer has an easy-to-read, two-line, five-digit, high visibility, backlit LCD display. Other features include one or two rate inputs, two rate alarms, dual rate unit ratio calculations (A/B, A-B or draw), as well as programmable average times, zero times, and decimal point.