Abstract: A liquid testing kit for determining the pH value of a liquid body at various depths includes a pH tester and a liquid sampling container having a spring-hinged lid. The container is adapted to be lowered to various depths with the lid in open position. The hinge is then remotely triggered to close the lid at the desired depth whereupon the container is removed from the liquid body. A self-seating ridged planar seal is employed between the lid and the container. The removed container can be stood upright, and a plurality of vertical internal supporting webs are dimensioned so as to accommodate a pH test instrument in the container. The hinge includes a crank arm having a support post against which a closing or opening tensile force is applied. The crank arm is pivoted from a first position wherein the tensile force creates an opening moment to a position wherein the post lies on the opposite side of a pivot so that a tensile force at the same post creates a closing moment.

Abstract: A pH measuring instrument includes a specimen probe having parallel front and rear panels with a planar electrode mounted on each and electrically coupled to a meter movement. Each electrode includes a broad flat electrolytically active surface. The probe is so dimensioned that the active electrode surfaces are parallel an spaced apart a distance less than the gripping capacity between the thumb and forefinger of an operator. A specimen pH value is measured after initial electrode treatment including a dry wiping of the active electrode surfaces, a cleansing of the active electrode surfaces with a plastic filamentous abrasive sponge pad held in one hand and wrapped around both electrodes and an in situ specimen preconditioning. The probe is removed after specimen preconditioning has been attained, recleansed and reinserted in the specimen, after which an accurate pH value measurement is indicated at the meter.

Abstract: A pH measuring instrument includes a specimen probe having parallel front and rear panels with a planar electrode mounted on each and electrically coupled to a meter movement. Each electrode includes a broad flat electrolytically active surface. The probe is so dimensioned that the active electrode surfaces are parallel and spaced apart a distance less than the gripping capacity between the thumb and forefinger of an operator. A specimen pH value is measured after initial electrode treatment including a dry wiping of the active electrode surfaces, a cleansing of the active electrode surfaces with a plastic filamentous abrasive sponge pad held in one hand and wrapped around both electrodes and an in situ specimen preconditioning. The probe is removed after specimen preconditioning has been attained, recleansed and reinserted in the specimen, after which an accurate pH value measurement is indicated at the meter.