A fluid sensing apparatus (120, 220, 320, 420, 520) comprising: a fluid flow channel (121, 221, 321, 421, 521) having an inlet and an outlet; a first fluid port (132, 232, 332, 432, 532) at a first location (131, 231, 331, 431, 531) of the fluid flow channel; a second fluid port (134, 234, 334, 434, 534) at a second location (133, 233, 333, 433, 533) of the fluid flow channel; a fluid sensor (130, 230, 330, 430, 530) in fluid communication with the first fluid port and second fluid port; and a laminar flow element (150, 250, 350, 450, 550) comprising a flow stabilisation rod (151, 251, 351, 451, 551) which extends along the fluid flow channel at least from the first location to the second location to define a fluid sensing portion (126, 226, 326, 426, 526) of the fluid flow channel between the outer wall (122, 222, 322, 422, 522) of the fluid flow channel and the outer surface (153, 253, 353, 453, 553) of the flow stabilisation rod and between the first and second locations, wherein the outer surface of the flow stabilisation rod is substantially continuous and the cross-sectional area defined by the outer surface of the flow stabilisation rod is substantially constant along the entire length of the fluid sensing portion, characterised by further comprising a flow restriction located between the inlet and the outlet; wherein the flow restriction comprises a reduction in the hydraulic diameter of the fluid sensing portion of the fluid flow channel which is caused by a decrease in the cross-sectional area of the fluid flow channel, the first fluid port at the first location of the fluid flow channel being upstream of the reduction in the hydraulic diameter, and the second fluid port at the second location of the fluid flow channel being downstream of the reduction in the hydraulic diameter. a fluid flow channel (121, 221, 321, 421, 521) having an inlet and an outlet; a first fluid port (132, 232, 332, 432, 532) at a first location (131, 231, 331, 431, 531) of the fluid flow channel; a second fluid port (134, 234, 334, 434, 534) at a second location (133, 233, 333, 433, 533) of the fluid flow channel; a fluid sensor (130, 230, 330, 430, 530) in fluid communication with the first fluid port and second fluid port; and a laminar flow element (150, 250, 350, 450, 550) comprising a flow stabilisation rod (151, 251, 351, 451, 551) which extends along the fluid flow channel at least from the first location to the second location to define a fluid sensing portion (126, 226, 326, 426, 526) of the fluid flow channel between the outer wall (122, 222, 322, 422, 522) of the fluid flow channel and the outer surface (153, 253, 353, 453, 553) of the flow stabilisation rod and between the first and second locations, wherein the outer surface of the flow stabilisation rod is substantially continuous and the cross-sectional area defined by the outer surface of the flow stabilisation rod is substantially constant along the entire length of the fluid sensing portion, characterised by further comprising a flow restriction located between the inlet and the outlet; wherein the flow restriction comprises a reduction in the hydraulic diameter of the fluid sensing portion of the fluid flow channel which is caused by a decrease in the cross-sectional area of the fluid flow channel, the first fluid port at the first location of the fluid flow channel being upstream of the reduction in the hydraulic diameter, and the second fluid port at the second location of the fluid flow channel being downstream of the reduction in the hydraulic diameter.