---
product_id: 4985811
title: "LT40"
brand: "extech"
price: "S$250"
currency: SGD
in_stock: null
reviews_count: 8
url: https://www.desertcart.sg/products/4985811-lt40
store_origin: SG
region: Singapore
---

# LCD display USB interface 1s-24h sampling LT40

**Brand:** extech
**Price:** S$250
**Availability:** ❌ Out of Stock

## Summary

> 💡 Light Up Your Data Game!

## Quick Answers

- **What is this?** LT40 by extech
- **How much does it cost?** S$250 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/4985811-lt40)

## Best For

- extech enthusiasts

## Why This Product

- Trusted extech brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Tailored Timing:** Selectable data sampling rates from 1 second to 24 hours for precise monitoring.
- • **Real-Time Readings:** LCD display shows current readings, min/max values, and alarm status.
- • **Compatibility Champion:** Includes analysis software compatible with Windows 2000, XP, and Vista.
- • **Professional Precision:** Perfect for professionals seeking accurate light measurement.
- • **Illuminate Your Insights:** USB interface for seamless data transfer and setup.

## Overview

The Extech LT40 LED Light Meter is a cutting-edge device designed for professionals who require precise light measurements. With its USB interface for easy setup and data download, selectable sampling rates, and a clear LCD display, this meter ensures you have all the tools necessary for accurate analysis. Compatible with various Windows operating systems, it’s the perfect companion for any light measurement task.

## Description

Extech LT40 LED Light Meter

## Features

- USB interface for easy setup and data download
- Selectable data sampling rates from 1 second to 24 hours
- LCD displays current readings, min/max and alarm status
- Includes Windows 2000, XP and Vista compatible analysis software

## Product Details

- **Brand:** Extech
- **Special Feature:** High Accuracy
- **Color:** White
- **Age Range (Description):** Adult
- **Included Components:** Extech LT40 LED Light Meter
- **Outer Material:** Plastic
- **Specification Met:** CE
- **Display Type:** Digital
- **Connectivity Technology:** Usb
- **Product Care Instructions:** Wipe Clean

## Images

![LT40 - Image 1](https://m.media-amazon.com/images/I/81stFVFgFmL.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: Does this item come with calibration certificate?**
A: Hello Antonio - there isn't a calibration certificate. Based on the various tests I've done the results make sense  and the machine is highly responsive. This isn't what I would regard as a precision instrument, but for my purposes g it worked fine.

**Q: Does this product come with a warranty?**
A: Hello, Thanks for your question, yes, the meter has a 2-year warranty, If you have any questions, please feel free to contact our tech support line at 866-477-3687 option 3

**Q: With the lt45 what light source setting should be used with fluorescent and sodium lights as the manual only lists incandescent and led's?...**
A: Hi, thanks for your question, there are 10 light source selections (L0 – L9) each having a unique calibration correction factor
(multiplier). See the Light Source list below. The multipliers for locations L0 through L6 are fixed
for the lighting types listed. Locations L7 through L9 are extra locations that the user can
customize (with a multiplier from 0.001 to 1.999).
L0: Standard incandescent light source
L1: LED white daylight
L2: LED AMBER (YELLOW) light
L3: LED GREEN light
L4: LED RED light
L5: LED BLUE light
L6: Not used
L7~L9: Programmable User Custom Locations (preset to 1.00) if you have any questions, feel free to contact our technical support line at 866-477-3687 option 3

**Q: Does this perform well in very bright conditions ( very sunny conditions) and in now light conditions?**
A: I feel that the Extech LT40 LED does respond fairly well in very bright conditions. As I see it, the meter is designed to read environmental conditions, such as light coming into a building or space, or even on the exterior. If you need to read just the solar conditions (visible light) in an unobstructed open space or area there are better, but often higher priced, meters for that purpose. Nick M

## Customer Reviews

### ⭐⭐⭐⭐⭐ Compact and effective
*by K***H on September 18, 2024*

Hard to beat this for compact, and its averaging function is helpful. Would be nice to save many averages so you can mark up a floor plan by just numbers, but you can always just mark up the readings.

### ⭐⭐⭐⭐⭐ I would buy it again.
*by D***K on December 22, 2014*

The Extech LT40 LED Light Meter is easy to use and appears to provide reasonable measurements. I say reasonable as i have no good method to determine the true accuracy of the meter, and the readings i get appear within a window of what i would expect for common light sources. I typically use it for readings of 10 foot-candles and below, usually in the 0.3 to 3.0 range, and with LED lighting, induction lighting, and metal halide lights.I performed a couple of measurements in an office environment and compared the readings to a lighting print of the area, and my readings were in the general area of what one would expect for the office area, and compared favorably with architectural lighting prints.The only drawback so far for me is the display is not backlit, so using it in the darker environment I am typically in can present a challenge at times, however, worst case I use the Hold feature and then read the display. Also, since the detector is fixed to the meter and not even rotatable, at times taking readings requires using the Hold feature if the meter needs to be facing away from me.For the money and the ease of use, I would buy this again.

### ⭐⭐⭐⭐⭐ Great meter. Get the one with separated sensor
*by K***. on November 29, 2021*

Great meter. Seems super accurate, and quality. The cap that covers the light sensor always reads 0 and calibrates every time you turn it on. I use it for testing light intensity from my grow lights in a grow tent. I found it would have been much easier to read the lcd screen if the sensor was separated from the main module/screen. My grow plants are very close to the grow light so I end up barely being able to view the screen and the light is blinding that close so it’s hard to even read the screen if I can view it. A separated sensor just gives you more options for reading, but I understand it would be less portable.

## Frequently Bought Together

- Extech LT40 LED Light Meter
- Extech LT300 Light Meter
- Leica Geosystems DISTO D2 New 330ft Laser Distance Measure with Bluetooth 4.0, Black/Red, 1.7 x 1 x 4.6 inches

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-03-11*