This Parallel Battery Holder is a must-have in every science lab. It provides a convenient way for students to connect and test circuits .After i put it to the test I can say that it works flawlessly. It's sturdy and holds the batteries securely. The price is also reasonable. The only downside is that it can only hold 6 batteries, so if you need more, you'll have to purchase multiple units. Overall, a great buy for any industrial and scientific setting..