Question

ph test *
heat source to burn
scale to weigh sample
cylinder with cheese cloth covering the base
electronic meter
percolation rate test *
heat source to burn
scale to weigh sample
cylinder with cheese cloth covering the base
electronic meter
humus content test *
heat source to burn
scale to weigh sample
cylinder with cheese cloth covering the base

Explanation:

For pH Test, an electronic meter (pH - meter) is used to measure the acidity or basicity of a solution. For Percolation Rate Test, a cylinder with cheese - cloth covering the base can be used to measure how quickly water passes through a soil or similar sample. For Humus Content Test, a heat source to burn the sample can be used to determine the amount of organic matter (humus) by burning off the organic part and weighing the remaining inorganic part.

Answer:

pH Test: Electronic meter
Percolation Rate Test: Cylinder with cheese cloth covering the base
Humus Content Test: Heat source to burn