Extech HD450 Datalogging Heavy Duty Light Meter

This unit is working great for my intended purpose (measuring shade on hiking trails). I have connected its voltage output to an analog data recorder so I can view the time-varying light intensity levels on my laptop. The unit has been working great for several weekends of hiking, and does correctly identify shade/sun conditions. My only problem is that the switches are not recessed, so the unit got jostled in my backpack and went into a mode where the data resolution became inadequate for my needs, however I bought a switch cover to fix that issue.

This is a well made meter with some nice features for a reasonable price. The data logging is good for unattended recording. The button push memory capacity is great if you need to record multiple readings but can't write them down as you go...like floating in a swimming pool:) The things we do for a living! Put it in a shallow plastic tub (oil drain tub), lay a towel in it to absorb any water that splashes, seal the meter (not the head) in a zip-lock baggie, throw on a floatation vest, and get paid to go for a swim! The software is pretty basic and hasn't been updated since 2007, but it works for what it is supposed to do, I am currently on Windows 7 and it works fine.

I used it for my plants 🪴 it seems to work well and is easy to use.

Works great, sensitive, durable and very affordable. If you just need to know relative light levels and are not concerned with hyper-accurate values, you can't beat the Ex-tech LT300. For me this a very good QA/QC tool for comparing scientific instrument consistency.

SEGUN LA INFORMACION DICE FOTOMETRO CON NISTMI PREGUNTA , NO VIENE CON CERTIFICADO NISTENTIENDO QUE DEBE TRAER CERTIFICADO NIST,PERO NO TRAE CERTIFICADO

Nice inexpensive meter. Agrees with my other units and gives me an inexpensive backup.

Love is a strong word, but I more than "like" this little meter, so "love it" it is. I chose this meter for my business to measure ambient light in rooms used to test people's eyes. It is extremely accurate, as I periodically test it against another digital meter and a manual needle meter used in photography. Everything is great about the product except that I have to manually calculate the reading I need because of my specific industry. Only units that are twice the price or more provide the specific calculation I need with the flip of a switch. But I have one such unit, and everytime I compare the readings of both machines, they are dead-on with each other. A little inconvenient, but worth it to me since this unit was about $300 less than my other light meter.

I needed to use this on a Linux computer, and even though it's a simple serial device ("Silicon Labs CP210x UART Bridge"), I can't communicate it because the manual doesn't include info about the serial interface (baud rate at the minimum would be nice...). The manual only points you to use their software, which is Windows only.

El equipo está bien, pero no me gusto que no le facturaron

Excelente equipo para medir la intensidad de la Luz, confiable y exacto

Práctico y útil en la medición de luz

I have had this unit before. The cord to attach cap snapped off first day when it slipped from my hand. The wire insert is fragile, which is why I had to replace my original.Works well.

Being used to calculate total sunlight over a period of time on a large African farm. Records data at anything between 2 and 99 second intervals which can then be downloaded to a PC for later analysis. Can also measure max and min levels as well as instantaneous measurements. Seems a very useful piece of kit.