電壓計

voltmeter

lightning / electricity / electric (bound form) / to get (or give) an electric shock / phone call or telegram etc / to send via telephone or telegram etc

voltage

to press / to push down / to keep under (control) / pressure

see 壓根兒|压根儿[ya4 gen1 r5]

surname Ji

to calculate / to compute / to count / to regard as important / to plan / ruse / meter / gauge