Acid hydrometers; Flowmeters; Measuring apparatus for temperature and humidity levels in gases and solid substances; Measuring apparatus, namely, angle finders; Measuring apparatus, namely, bevels; Measuring apparatus, namely, clamp meters for measuring electricity; Measuring instrumentation and apparatus, namely, digitizers; Optical apparatus and instruments, namely, optical ports for underwater photography, dome ports for underwater photography, wet diopters, adapter lenses for underwater p...