High-Level Peroxide Test Strips, 0-400ppm, 50-Vial Subcategory_Brushes Open-frame demonstration DC motor exposing

Open-frame demonstration DC motor exposing armature

Cutaway hand-powered Wankel rotary model at 8 by 7 by 3

Entry-level two-part human skull model separates the skull cap to reveal the cranial cavity for introductory head-anatomy teaching at secondary and college levels

sodium benzoate

Low-level peroxide test strips in a 50-strip vial calibrated at 0

High-Level Peroxide Test Strips, 0-400ppm, 50-Vial Subcategory_Brushes Open-frame demonstration DC motor exposingHigh level peroxide test strips in a 50 strip vial calibrated at 0, 100, 200, and 400 ppm, sized for pool, hot tub, and concentrated oxidizer monitoring in water treatment workflows.