These are okay. No O-ring. You may need some caulk if you want to waterproof something.
Rating: [3 of 5 Stars!]
By
RKBA11411
Date: June 24, 2016
Hammond GS (4.834; x 3.734; x 1.234;) product size is a good fit for the SparkFun Decade Resistance Box project. Great little kit for simulating different resistances from 10 Ohm to 1M Ohm.