MTG MARPAC EFPI RF 1" BV X050COA 5%NIST No Disp Duct Probe Rango de Presion:0 a 1" w.c. 5%NIST No Disp Duct Probe 18" insertion length for use with the Model UHH Universal Handheld device and the Mobile Meter Software application MTG MARPAC EFPI RF 1" BV