Sound velocity meter "inno"

A digital sound velocity meter for magnetic mounting, giving an accurate and fast measurement of the speed of sound in gases and liquids on a four-digit 26 mm LED display readable from a distance. Its measuring range is 99.99 ms with 10 μs resolution, a rotary switch for fine sensitivity adjustment and a reset button; the stop signal is picked up by an encapsulated electret microphone with a waterproof membrane, over a measuring section of up to about 250 cm. It runs on four 1.5 V cells (included) or an external 6 V/500 mA supply (P3120-6N); green ABS case, approx. 160 x 120 x 45 mm, probe leads about 150 cm. A loudspeaker (MB240-1L or DW240-2L) and the measuring tube DW280-2R are also required.