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Blog
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April 08, 2021
Vernier scales can be used on microscopes, stereotaxic frames and micromanipulators. The vernier scale was invented by French mathematician Pierre Vernier in 1631 as an upgrade on Pedro Nunes' measurement system for precision astrolobes. With a main scale and a sliding secondary scale, a vernier is used for making precise measurements.
How a Vernier Scale Works
The vernier scale is marked with divisions slightly smaller than the divisions of the main scale. For example, a vernier scale could have 11 markings for every 10 on the main scale. That's 10 divisions on the vernier scale for every 9 on the main scale. This means that the vernier divisions are each 90% of the main scale divisions. In this case, the 0-line and the 10-line...more
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April 06, 2021
A peristaltic pump is a popular appliance in any laboratory. Here you will find some tips for choosing the correct tubing to use for your application with your Peri-Star Pro peristaltic pump.
Size (ID) of Tubing
In a peristaltic pump, the flow rate is determined by both the size of the tubing and the rotor speed. WPI provides two sizes of silicone tubing:
- 1/16-inch ID tubing for low flow rate at 0.2-18mL/min.
- 1/4-inch ID tubing for high flow rate at 3.5-280mL/min.
Types of Tubing
- Silicone tubing has a long service life and good chemical compatibility for aqueous and many organic solvents.
- Fluoroelastomer tubing should be used when pumping halogenated solvents.
- Vinyl tubing is used...more
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April 06, 2021
When using the Peri-Star Pro, solutions pumped should never come into contact with the pump. Here we will give you some guidelines for operating your peristaltic pump in a way that is safe for both the laboratory personnel and for the machinery.
Some solvents can permanently damage a peristaltic pump. The following rules are recommended to avoid leakage when running your Peri-Star Pro peristaltic pump.
- Follow safety rules when handling aggressive solvents.
- Pull a fresh section of tubing into the tubing fixtures regularly. If the pump gets heavy use, do this weekly.
- A fresh section of tubing should be pulled through the pump rollers before the pump is left to run unattended.
- Change the tubing immediately, if it is visibly worn.
- Be sure the tubing...more
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April 06, 2021
A peristaltic pump is a type of positive displacement pump used for pumping a variety of fluids, particularly clean, sterile or aggressive fluids. Here are five reasons to choose the Peri-Star Pro peristaltic pump.
The fluid contacts only the interior of the flexible tube and thus avoids contamination from the pump or damage to the pump. This makes it easy to maintain and clean.
The Peri-Star Pro peristaltic pump provides accurate and precise fluid delivery. It can run at flow rates from 0.1mL/min. to 280mL/min. with better than 0.5% accuracy.
Peri-Star Pro has a backlit digital LCD display and a water-resistant membrane keypad.
A unique planetary gear design with eight actively driven rollers (four rollers in the higher flow rate model), together...more
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March 05, 2021
WPI’s disposable scalpels come in eight different styles and can be used for a wide variety of applications. Here you can see what makes WPI inexpensive, disposable scalpels such a popular tool.
Disposable scalpels are perfect for one-time surgical uses, dissections, woodworking, taxidermy, clay modeling and more. They are ideal for students, researchers, and crafters.
- WPI disposable scalpels have surgical stainless-steel blades installed on plastic handles.
- The plastic handle of the scalpel is textured to ensure a firm grip, and it is lightweight for comfortable use.
- The handle includes a handy, integrated 6 cm metric ruler etched on it.
- They come sterile and individually wrapped, with 10 blades in each...more
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March 05, 2021
WPI’s disposable scalpels come in many styles and are ideal for students, researchers, and crafters. Here we will describe some of the uses for these popular blades.
Scalpel blades come in a variety of shapes so that you can choose the ones best suited to your application.
The #10 blade is a commonly used blade for surgical applications. It is used for making large incisions through skin and subcutaneous tissues. It is similar to the #20 blade, which is somewhat larger. The #20 blade is used for larger incisions through thicker tissues or for dissection of the soft tissues in larger animals.
Blades #10, 15...more
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February 25, 2021
NanoFil™ is a unique low volume syringe developed for improved microinjection in mice and other small animals. RPE and IO kits are specially designed for “hands-free” and oil-free sub-microliter injection. Originally developed for retinal pigment epithelium and intraocular injection, they can also be used for other applications.
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February 25, 2021
PUL-1000 is a microprocessor controlled, four-stage, horizontal puller for making glass micropipettes or microelectrodes used in intracellular recording, patch clamp, microperfusion and microinjection. The PUL-1000 is capable of producing a vast array of pipette shapes, such as a long graduated taper, a short graduated taper and a short taper bee stingers. Here's a quick introduction the PUL-1000 research puller.
The PUL-1000 puller was designed with tight mechanical specifications and precision electronics for complete control of the pulling process and accurate reproducibility. It offers programmable sequences of up to four steps...more
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February 25, 2021
NanoFil™ is a unique low volume syringe developed for improved microinjection in mice and other small animals. It comes in both 10 and 100 microliter volumes and can be paired with a UMP3 UltraMicroPump for making accurate microliter injections. NanoFil stainless steel needles range in size from 33 to 36 gauge.
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February 25, 2021
NanoFil™ is a unique low volume syringe developed for improved microinjection in mice and other small animals. Here we show you several ways in which the NanoFil can be used for making injections. You can install the syringe on WPI’s UMP3 UltraMicroPump, using SilFlex tubing and a holder, so you can accurately inject by hand. You can install it...more