Key facts
- Brand
- EXTECH
- Model
- HD400
- Category
- Other Electronics
- Documents
- 2
- Languages
- EN
- Last added
- 2026-10-03
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EXTECH Heavy Duty pH mV Temperature Meter Model 407227 user manual
The Extech HD400 is a precision instrument designed for measuring illuminance in Lux and Foot candles. It features a large backlit LCD display, a fast-responding silicon photo-diode sensor, and meets CIE photopic spectral response standards. The device includes advanced functions such as Peak Hold, Data Hold, Maximum/Minimum memory, and Relative Mode to capture and analyze light levels effectively.
Read onlineEXTECH HD400 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 HD400 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
What units can the HD400 measure?
The meter measures illuminance in Lux and Foot candles (Fc).
From: EXTECH Heavy Duty pH mV Temperature Meter Model 407227 user manual
How long does the automatic power off feature last?
The meter turns off automatically after 20 minutes of inactivity.
From: EXTECH Heavy Duty pH mV Temperature Meter Model 407227 user manual