To address concerns on low level blast exposure and brain health, data collections were conducted to measure the blast overpressure environment around US service members during military training. Field data were collected to compare performance of two sensors during explosive breaching, shoulder-fired weapon, and mortar training. Measurements were made using small, wireless blast sensors by BlackBox Biometrics (B3) and laboratory-grade overpressure sensors (PCB pencil probes). The B3 gauges were mounted on stakes with the pencil probes at multiple locations around the blast source. The data (15 points) shows B3 gauges record a short “spike” with peak overpressures higher than PCB pencil probes. This is explained by a partial stagnation of the blast wave on the case and protective screen of the B3 gauge causing an increase in the measured peak overpressure. The remainder of the B3 gauge overpressure time history is generally in good agreement with the pencil probe data. The differences in peak overpressure for the stake-mounted B3 gauges and pencil probe were between 8.3 and 159.0%. The differences in B3 gauges mounted facing the blast and rotated 90° from the blast are discussed. The differences in peak overpressure impulse (a measure of energy) for the stake-mounted B3 gauges and pencil probe were between −4.9 and 14.6%. B3 gauges were designed to be worn on the body. If researchers place small, wireless sensors on a test array, it is important to consider the shock interaction with the sensor and array when comparing to reference sensors such as pencil probes. Understanding these differences can allow service members or researchers to measure peak overpressures and impulses with B3 Blast Gauges and make informed decisions about the data. Many blast injury correlations use incident peak overpressure and impulse as inputs.