Is there any reason the yellow pulse light won’t work

If you have set the switch to MEM, it should light if it detects a pulse. If there is no activity at the test point, it should not light at all.

Can i buy the probe seperate ? Cause i lost mine

This comes as a complete unit so I doubt you could find the probe only anywhere. You could try to make one though.

What is the operating voltage? Will it work with 1.5V circuits up to 12V?

From the manual : Power Supply: 5 – 15V DC | TTL level is nominal 0 to 5V DC and CMOS levels are 0 to 5-15V DC. You powerup the device straight from the circuit. You will find the manual --> https://www.lasertools.co.uk/items/PDF/Products/5263_Instructions.pdf From what I can tell from the manual a logic 1 is when voltage is above 2.3V. and logic 0 below 0.8V.

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5263 Logic Probe DC,Black

Product ID: 60122562

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📏147cm leads

🔊Audio indications

🔌Powered by circuit

Description

🔧 Get Connected, Get Results!

📏 EXTRA LONG LEADS - 147cm of flexibility for hard-to-reach areas.
✅ CE RO HS COMPLIANT - Safety and environmental standards you can trust.
🔧 LIGHTWEIGHT DESIGN - Weighs only 80g for easy handling and portability.
🔋 POWERED BY THE CIRCUIT - No batteries needed—just plug in and go!
🔍 SIMPLIFY TROUBLESHOOTING - Experience effortless diagnostics with visual and audio feedback.

The Laser5263 Logic Probe DC is a lightweight, user-friendly tool designed for efficient troubleshooting. With visual and audio indications of logic levels and pulses, it simplifies diagnostics while being powered directly by the circuit under test. Its extra-long 147cm leads provide flexibility for various applications, and it meets CE and RoHS compliance standards for safety and environmental responsibility.

Specifications

Manufacturer	Tool Connection (EU)
Brand	Laser
Model	5263
Product Dimensions	2 x 9 x 27 cm; 80 g
Item model number	5263
Manufacturer part number	LAS5263
Item Weight	80 g

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