2-Prong Single-Adjustable Universal Clamp with Boss Head, Large Lab Supplies_Stopwatches & Timers Four-socket E10 lamp holder pre-wired

Four-socket E10 lamp holder pre-wired in series on a hard-plastic base with two 4mm banana terminals

with a slide-bar carriage carrying a phosphor-bronze contact and three binding posts

Two pith balls suspended on unspun silk from a brass pillar

Regulated dual AC/DC power supply displaying voltage and current on independent digital readouts

2-Prong Single-Adjustable Universal Clamp with Boss Head, Large Lab Supplies_Stopwatches & Timers Four-socket E10 lamp holder pre-wiredTwo prong single adjustable universal clamp with an integral bosshead and non slip vinyl sleeves, gripping burettes and flask necks from 12 to 45 mm on retort stand rods.