Digital thermometers are portable temperature sensing devices that have permanent probes and a digital display

Digital panel meters measure and display processes and electrical variables via an alphanumeric digital readout

Temperature instruments use contact or noncontact methods to measure temperature.

Digital multimeters (or multi-meters) are used to measure electrical quantities such as voltage, current, resistance, frequency, temperature, capacitance, and time period measurements

Analog panel meters measure and display processes and electrical variables with a simple dial display

Digital LED displays are segmented or dot matrix displays allowing for numeric only and alphanumeric character representation

Liquid flow meters are used for measuring the flow or quantity of a moving fluid