HD450 2.02.0 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program lies within System Utilities, more precisely Device Assistants.
Commonly, this program's installer has the following filenames: HD450.exe and HD600.exe etc. HD450 is suitable for 32-bit versions of Windows 7/8/10/11. The actual developer of the free software is Extech Instruments.
The following version: 2.0 is the most frequently downloaded one by the program users. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
This program can collect data from HD450 light meter. It can read the data directly from the meter, when it is connected to your PC; it can also download stored data from the meter’s memory. The data may be displayed graphically or as text. The maximum number of Real Time data points is 10,000; on-board datalogging memory can record 16,000 data points.
You may want to check out more software, such as Snappy Fax 2000 or SoftX Internet Logger, which might be similar to HD450.