IMPULSE: 3W LED flashlight. Aluminium and rubber body. 2D

Hyper-resistant aluminium LED torch. With wrist band. Works with 2 D batteries (not supplied). Super bright 130lm (3W), water and shock resistant.

Micromachines, Free Full-Text

Work flashlights

Workhorse™ 2D LED Hanging Ring Flashlight - Rayovac

THEA CV Pilot Tests Lifesaving Applications at American Center for Mobility - Tampa Hillsborough Expressway Authority

1pc Rechargeable High Lumen Led Flashlight Waterproof Zoomable 3 Modes Adjustable Brightness Perfect Outdoor Emergency Tactical Camping Includes 16340 Batteries - Sports & Outdoors - Temu

AlpsWolf Rechargeable Flashlight, LED Spotlight Flashlight 20000 Capacity 4000LM 25h Ultra-Long Standby 3+4 Lights Modes Ultra Bright Flashlight Waterproof with USB Output as a Power Bank : Everything Else

Practical experience with devices to measure 02 content, turbidity, solid matter content and electrical conductivity used for monitoring water quality in rivers