Abstract: Ergonomic and easily serviceable vacuum probe. The probe for applying a vacuum has a see-through chamber in which a particulate filter is disposed so that the contamination level in the chamber is monitorable for servicing the filter. The probe is vacuum-dependent and sized to be gripped by a person's hand making a fist therearound including around the handle which extends longitudinally of the body. By squeezing the handle toward the body, a valve plunger is pushed radially inwardly to open the valve to apply vacuum. The valve is spring-biased to return to the closed position upon release of the handle.