Key facts
- Brand
- EXTECH
- Model
- HD450
- Documents
- 3
- Languages
- EN
- Last added
- 2026-10-03
Start here
Extech HD450 Digital Light Meter User's Guide
This user's guide explains how to operate the Extech HD450 digital light meter, including powering it on, selecting measurement units and ranges, taking readings, and using features like data hold, peak hold, and relative mode. It also covers setting up the clock and sample rate, storing up to 99 readings manually or 16,000 readings automatically, and connecting the meter to a PC via USB for data transfer and analysis using included software.
The meter measures illuminance in Lux and Foot candles, features a 4000-count LCD with bargraph, and includes automatic power-off and backlight functions. Specifications include accuracy, spectral response, and operating conditions. The guide provides step-by-step instructions for all functions and troubleshooting tips for common issues like low battery or out-of-range measurements.
EXTECH HD450 specifications
| Fc Range | 40, 400, 4000, 40.00kFc |
|---|---|
| Lux Range | 400, 4000, 40k, 400kLux |
| Accuracy | ±5% rdg |
| Max Resolution | 0.01Fc/0.1Lux |
| Datalogging (HD450) | 16,000 continuous readings; 99 selected readings |
| PC Interface | USB |
| Dimensions | 6.7 x 3.1 x 1.6 in (170 x 80 x 40 mm) |
| Weight | 13.7 oz (390 g) |
Source: Extech HD400 and HD450 Heavy Duty Light Meters Product Leaflet
All EXTECH HD450 documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Questions answered in these manuals
How many readings can the HD450 store?
The HD450 can automatically store up to 16,000 continuous readings and manually store or recall up to 99 selected readings.
From: Extech HD400 and HD450 Heavy Duty Light Meters Product Leaflet
What is the measurement accuracy of the HD400 and HD450 meters?
Both meters provide an accuracy of ±5% of the reading.
From: Extech HD400 and HD450 Heavy Duty Light Meters Product Leaflet
How many readings can the HD450 store?
The HD450 can store up to 16,000 readings in its internal memory for download to a PC.
How do I connect the HD450 to a PC?
Use the USB cable included with the meter to connect it to a PC’s USB port. The meter comes with Windows-compatible software for data transfer and analysis.
What units can the HD450 measure?
The meter measures illuminance in Lux and Foot candles (Fc).
From: Extech HD450 Heavy Duty Datalogging Light Meter User's Guide
How many readings can be stored on the meter?
Up to 16,000 readings can be stored for download to a PC.
From: Extech HD450 Heavy Duty Datalogging Light Meter User's Guide