DLI-500 PAR, Daily Light Integral, and Photoperiod Meter - Full-Spectrum 400-700 nm Light Measurement Tool for Plants & Agriculture

Very precise instrument. DLI is the most important piece of growing cannabis. This meter provides precision DLI as well as led intensity or PPFD. A little pricey but the instrument is 2nd to none. I use it throughout my grow.

Good product. But don't get it wet

If I had to force a complaint I'd say I wish I didn't have to remove 2 screws to access the USB-C port, but I have no doubt it's concealed where it is for a reason, and it's not much of an inconvenience at all. Otherwise it's all positive marks for the DLI-600. The universal thread is a great idea, I picked up an inexpensive, telescoping tripod/wand to use for quick and long term readings. Compared these readings with a 2 year old MQ-510 and they're nearly identical. Easy to access the files via the included USB-C cable on my laptop. You get what you pay for and I have no doubt this DLI-600 will be taking accurate readings for years to come. No more burning, or under lighting my plants. Keep up the good work, Dr. Bruce.

Compré tres de estos instrumentos para iniciar unos experimentos y uno de los fotometros ni siquiera se prendió. Esto atrasa considerablemente el trabajo que debia iniciar. Decepcionada. Intentare devolver el instrumento dañado ya que me encuentro en otro pais. Por el valor del producto no deberian enviar piezas con fallas

Very easy to use. It is easy to give a plant too much light. If you use this meter your plants will get just what they need.

Exactly what I needed for my experiment!

This died within a month while out in thunderstorms occasionally. It seemed accurate but to read it you have to open it, which disconnects the batteries and forgets today’s results. It only records CSV with data for every half hour for ten days (and daily for 100 days I think), even though it samples more frequently. It didn’t show up when connected to my iPad or modern Mac, but it did intermittently connect to my very old Mac (from 2006). I loved it despite these problems but for the price I need it to survive the weather.

The battery compartment screw was completely stripped and the screw falls out. It arrived like that. Incredibly poor design for an expensive instrument.