I love gadgets. Especially the gadgets that help me find and document critters.
Here are some of my favorites:
A spoon: spoons are the most useful thing when you go out and document little critters. They are great for scooping things out of water and taking closeup macro shots. Where to get: eat some ice cream, and keep the spoon.
Aquatic critter set: in addition to you plastic spoon, regular aquarium nets (different sizes), white plastic trays, and white mochi trays are great for collecting aquatic life for observations and documentation. Don't forget to freeze or sun-bath your equipment for a few days between samplings, to avoid cross contamination of the habitat, by moving invasive species and pathogens. Where to get: aquatic nets from the pet store, white trays from art store or the Container Store, and eat some mochi for the perfect tray!
Slide-on smartphone macro lens: I love the slide-ons, as I don't need to remember to grab it, it's always there. I also don't need to find the exact spot to connect the lens - it simply slides on to the right spot. I used two brands - Shiftcam and ulanzi. I found ulanzi to be better built and lasts longer. Where to find: unfortunately, both options are no longer available on their official websites. You might find them on eBay and AliExpress. Make sure you get the right one, as it comes with the entire case. It has to fit your phone.
Higher magnification smartphone lens: I use a uHandy lens to collect, view, and photograph tiny aquatic organisms in the field, such as water fleas and ostracods. I use a plastic 3 ml pipette to place the critters on the lens. Where to find: Amazon.
Kuangren Macro Flash: you won't only look like a strange bug, but it's also a great solution for adding light to your macro shots. At least on my Sony alpha camera, I need to use it on manual settings, but once I got use to it, I cannot use anything else. Please note that they are not highly reliable, and it might take you a while to find the right one (they are sold under different names too), but they worth it. Where to buy: Amazon.
For a diffuser, you can improvise something, or try these Neewer mini soft box. Where to buy: Amazon.
Underwater & sturdy camera: like many of my friends, I use an Olympus Tough TG-6 camera for my underwater photography - in tide pools, creeks, and ponds. But it's also useful as an all-weather camera, with a great macro option and a built-in GPS. I highly recommend adding a flash diffuser. Even though it's not my preferred camera for every activity, I find it very useful and fun to use for certain activities. Where to find: Olympus website.