High-end home lab equipment

Agar plates, stains and reagents last longest cold, and none of them belongs next to food. A fridge you never open for lunch is the minimum.

A household fridge swings in temperature every time the door opens, and it gives no warning when it drifts. Small dorm-style fridges are the least steady, and the CDC advises against them for storing vaccines.

A lab refrigerator is built to hold one temperature and tell you when it can't. Look for a display you can read without opening the door, an alarm and a lock.

The KoolMore here has all three. Air blows down from the top and forms a barrier along the glass door, and KoolMore states the inside stays within 1 °C. A battery keeps the display and alarms running for 24 hours in a power outage.

Mark the door for lab use only. The lab safety guide covers the other bench habits, and genetics experiments at home explains how to handle agar plates.

Enzymes, competent cells and frozen bacterial stocks go in a freezer, and the defrost system matters more than the size.

A frost-free freezer melts its own frost by switching on a heater behind the freezer wall. GE Appliances says most models do it once or twice a day, for 25 to 45 minutes.

That is harmless for frozen peas. For temperature-sensitive stocks, a manual-defrost freezer avoids those cycles entirely.

The trade is a little upkeep. GE recommends defrosting once the frost is 1/4 to 1/2 inch thick, after moving the contents to a cooler with ice packs.

The Whynter CUF-112SS here is manual defrost, 1.1 cubic feet and under 20 inches tall, so it fits beneath a bench. Its dial sets between -11 and 10.4 °F, and the door locks with a key.

Thaw enzymes on ice and pipette them cold. How to use a micropipette covers the small volumes.

Boiling doesn't sterilize agar, broth or glassware, because some bacterial spores survive 100 °C.

Lab autoclaves use steam at 121 °C, and a pressure canner reaches that temperature at 15 psi. Flinn Scientific's safety notes for schools name a pressure cooker as the substitute when there is no autoclave.

Look for a steam gauge you can read, a regulator weight that holds the pressure steady, and a pot tall enough for media bottles standing upright.

The All American 921 here seals metal to metal, so there is no rubber gasket to wear out. It has a steam gauge and a machined regulator weight, holds 18 pint jars, and works on gas, electric and flat-top stoves.

Loosen bottle caps before a run, and never open the lid while the gauge shows pressure. Using a pressure canner as an autoclave walks through a full cycle.

A binocular microscope has two eyepieces. A trinocular adds a third, upright port for a camera, so you can keep looking through the eyepieces while it records.

For the odd photo, a phone on a binocular scope costs less, and phone photos through a microscope shows how. If you photograph every slide, a fixed camera port saves lining up a phone each time.

Look for 4X, 10X, 40X and 100X oil objectives, a mechanical stage that moves the slide with knobs, and a camera that works with your computer.

The SWIFT SW350T here has all of those, plus a Siedentopf head that changes eye spacing without losing focus. It ships with a USB camera, software for Windows and Mac, 100 blank slides and 100 cover slips. Swift SW350T vs SW380T compares it with its sibling.

The 100X objective needs oil, covered in how to use immersion oil. Other cameras are matched by model in microscope camera adapters.

Buffers and growth media only work at the right pH. A strip gives a color to match against a chart, which is fine for a rough check.

A benchtop meter gives a number instead. The Apera PH700 here reads to 0.01 pH with a combined pH and temperature electrode.

A meter is only as good as its last calibration. Apera recommends calibrating before every test when you need accuracy within 0.02 pH, and about weekly for work within 0.1.

Recalibrate when the electrode is new or has sat unused, after measuring a strong acid or base, or when a sample is much warmer or colder than the buffers.

The PH700 calibrates at one to three points and shows the electrode's condition. It comes with pH 4, 7 and 10 solutions and a holder for two electrodes. Store the electrode wet, never dry.

A mini centrifuge spins 1.5 mL tubes. Pelleting bacteria from a bigger culture takes a centrifuge that holds 15 mL tubes.

Every run has to be balanced. Load tubes in pairs directly across from each other, with both tubes in a pair holding the same mass.

With an odd number of samples, add a tube of water opposite the single one and match its mass. INTEGRA Biosciences explains why it matters, since a small imbalance is magnified at speed and the rotor wobbles. How to balance a centrifuge shows which counts work in each rotor.

The ONiLAB here holds six 15 mL tubes, with adapters for smaller ones. It runs from 300 to 5000 rpm, up to 2600 × g, set by speed or g-force, with a timer up to 99 minutes.

The lid stays locked until the rotor stops. Protocols often give g-force, and the RCF calculator converts it. Smaller tubes are covered in mini centrifuge tube adapters.