Here's a prism solution that's ideal for night or low-light job conditions.

This prism features a red LED strobe light that pulses every two seconds. All electronics including the battery are securely housed in the canister. The battery - a Sanyo CR-1/3N - is the same used in many cameras and holds a charge for approximately 48  hours.

Weighs: 0.60 lbs. (0.26kg)