( ( ( ( Observation tools ) : ) ( ( Microscope , ) ( hand lens ) ) ) . )
(ROOT (NP (NP (NN Observation) (NNS tools)) (: :) (NP (NP (NNP Microscope)) (, ,) (NP (NN hand) (NN lens))) (. .)))
Observation tools: Microscope, hand lens.
(ROOT (S (NP (DT A) (NN microscope)) (VP (MD would) (ADVP (RBS best)) (VP (VB help) (S (NP (DT a) (NN person)) (VP (VB observe) (NP (NP (DT the) (NNS parts)) (PP (IN of) (NP (DT a) (NN plant) (NN cell)))))))) (. .)))