Dwyer 477AV-2 Manometer Manometer, Digital, 0 – 40 in. w.c/0 – 10 kPa – Each

Instant selection from up to nine English/metric units: PSID, in H₂O, mm H₂O, in Hg, mm Hg, Pa, kPa, bar, Mbar
Stores 20 readings in memory for later reference
Measure positive, negative or differential pressures
Audible and visual overpressure alarms
Large, easy-to-read 0.4″ LCD readout includes switchable backlight
Electronic zeroing lets you null out any minor differences
Display hold key freezes current pressure reading reading
Operates up to 100 hours on a single 9 Volt battery
Auto shut-off to minimise battery drain
FM approved as intrinsically safe for hazardous locations Class 1, Div. 1, Group A, B, C, D, T4.