Fluid testing

Abstract

A fluid testing device may include a fluid interaction element and a fluid chamber to contain a fluid to be sensed by the fluid interaction element. The fluid chamber may form a first gap through which fluid is to be wicked to a second gap that is opposite the fluid interaction element and less than the first gap.

1 . A fluid testing device comprising:
 a fluid interaction element; and   a fluid chamber to contain a fluid to be interacted upon by the fluid interaction element, the fluid chamber forming a first gap through which fluid is wicked to a second gap in the fluid chamber that is opposite the fluid interaction element and less than the first gap.   
     
     
         2 . The fluid testing device of  claim 1 , wherein the first gap spaces a first interior surface of the chamber and a second interior surface of the chamber and wherein the fluid interaction element projects from the first surface towards the second surface to form the second gap. 
     
     
         3 . The fluid testing device of  claim 1 , wherein the first gap spaces a first interior surface of the chamber and a second interior surface of the chamber and wherein the chamber further includes a pedestal projecting from the first surface and supporting the fluid interaction element opposite the second gap. 
     
     
         4 . The fluid testing device of  claim 3 , wherein the fluid interaction element is at least partially received within the pedestal. 
     
     
         5 . The fluid testing device of  claim 3 , wherein the chamber further includes a protuberance projecting from the second surface opposite the fluid interaction element to form the second gap. 
     
     
         6 . The fluid testing device of  claim 1 , wherein the first gap spaces a first interior surface of the chamber and a second interior surface of the chamber and wherein the chamber further includes a protuberance projecting from the second surface opposite the fluid interaction element to form the second gap. 
     
     
         7 . The fluid testing device of  claim 6 , wherein the fluid interaction element projects from the first surface towards the second surface opposite the protuberance. 
     
     
         8 . The fluid testing device of  claim 6 , wherein the fluid interaction element is at or below the first surface and opposite the protuberance. 
     
     
         9 . The fluid testing device of  claim 1 , wherein the second gap is no greater than 1 mm and wherein the first gap is at least 50% larger than the second gap. 
     
     
         10 . The fluid testing device of  claim 1 , wherein the first gap is at least 1.5 mm. 
     
     
         11 . The fluid testing device of  claim 1 , wherein the fluid interaction element is on a first side of the second gap, the fluid testing device further comprising a second fluid interaction element opposite the second gap on a second side of the second gap opposite the first side. 
     
     
         12 . The fluid testing device of  claim 1 , wherein the chamber opposite the second gap is transparent. 
     
     
         13 . The fluid testing device of  claim 1 , comprising an elongate stick forming the chamber, the chamber having an inlet proximate an end of the stick. 
     
     
         14 . A fluid testing method comprising:
 wicking fluid into a first gap in a chamber of a fluid testing device; and   interacting with the fluid with a fluid interaction element while the fluid is in a second gap in the chamber that is adjacent the first gap in the chamber and less than the first gap.   
     
     
         15 . A fluid testing stick comprising:
 a first end supporting a controller; and   a second end forming a fluid interactor, the fluid interactor comprising:   a fluid interaction element under control of the controller; and   a fluid chamber to contain a fluid to be sensed by the fluid interaction element, the fluid chamber forming a first gap through which fluid is wicked to a second gap in the fluid chamber that is opposite the fluid interaction element and is less than the first gap.   
     
     
         16 . The fluid testing device of  claim 1 , wherein the fluid interaction element is to interact with the fluid while the fluid is in the second gap of the fluid chamber. 
     
     
         17 . The fluid testing method of  claim 14 , further including positioning a volume of the fluid in the second gap and adjacent to the fluid interaction element. 
     
     
         18 . The fluid testing stick of  claim 15 , wherein the second gap is to position a volume of the fluid adjacent to the fluid interaction element and the fluid interaction element is to interact with the volume of the fluid while the volume is in the second gap of the fluid chamber.