The FH 40 G-L10 is a digital survey meter for many different radiation protection applications. It incorporates an energy-filtered proportional detector. It meets the energy response behaviour of the new units ambient dose equivalent and ambient dose equivalent rate (H*(10)). Measured values are shown on a clear, backlit LCD display including a 3 decade logarithmic bargraph. An intelligent algorithm detects and indicates small changes in dose rate, suppressing random noise. The FH 40 G-L10 records up to 256 data points containing measurement number, date, time and dose rate. The stored values can be read directly from the display of the device and can also be transferred to a PC via a serial IR interface. The IR interface cable and the software are available as options. The survey meter is rugged, lightweight and easy to operate with large keys.