A CYCLING POROMETER WHICH IS HAND HELD AND IS USED FOR MEASURING THE STOMATAL RESISTANCE OF PLANT LEAVES. IT IS A MEASURE OF THE RESISTANCE TO LOSS OF WATER VAPOUR THROUGH THE STOMATA AND IS AN INDICATOR OF THE PHYSIOLOGICAL STATE OF THE PLANT. IT WORKS BY MEASURING THE TIME IT TAKES FOR A LEAF TO RELEASE SUFFICIENT WATER VAPOUR TO CHANGE THE RELATIVE HUMIDITY IN A SMALL CHAMBER BY A FIXED AMOUNT. THIS IS COMPARED WITH A CALIBRATION PLATE OF KNOWN RESISTANCE IN ORDER TO DERIVE THE STOMATAL RESISTANCE OF CONDUCTANCE OF THE LEAF. THE INFORMATION IS DISPLAYED ELECTRONICALLY ON THE DEVICE'S SCREEN.

CLASSIFICATION HAS BEEN DETERMINED IN ACCORDANCE WITH THE FOLLOWING: GENERAL INTERPRETATIVE RULES (GIR)S GIR 1 HAS BEEN USED TO CLASSIFY THIS PRODUCT BY THE TERMS OF HEADING 9026 INSTRUMENTS AND APPARATUS FOR MEASURING OR CHECKING THE FLOW, LEVEL, PRESSURE OR OTHER VARIABLES OF LIQUIDS OR GASES (FOR EXAMPLE, FLOW METERS, LEVEL GAUGES, MANOMETERS, HEAT METERS) EXCLUDING INSTRUMENTS AND APPARATUS OF HEADING 9014, 9015, 9028 OR 9032 GIR 6 HAS BEEN USED TO CLASSIFY THE GOODS TO SUBHEADING LEVEL 902680 OTHER INSTRUMENTS OR APPARATUS CN CODE 90268020 ELECTRONIC. ALSO CLASSIFIED IN ACCORDANCE WITH: HSENS TO 9026