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Ask Lab Guy:

  • For advice on SP lab equipment, supplies, etc.
  • How to make something work - products, processes, applications
  • Where to find resources on a scientific topic or process

August 9, 2018
Image: Roxy M Repeating Pipettor 37310-0000_54

Dispense Liquids Accurately and Consistently

Dear Lab Guy, I am looking for a pipettor that can be adjusted to dispense liquids in .5ml increments. I purchased one of the Roxy M pipettors recently but I am not sure if this is really what I am looking for? - Ben F.
August 2, 2018
Image: 50000-0002 - Bel-Art Small Molded Polyethylene Benchtop Fume Hood with acrylic sash

Matching an Exhaust Fan to a Fume Hood

Dear Lab Guy, For your part# H50000-0002 just wondering if you had a fan/blower or extraction system to go along with the fume hood. Client does not have an ability to plug this unit into an existing system. - Glen G.
July 31, 2018
Image: I have been trying to homogenize heart tissue in the Bel-Art Mini Liquid Nitrogen Cooled Mini-Mortar set

Homogenizing Frozen Samples Efficiently

Dear Lab Guy, I have been trying to homogenize heart tissue in the Bel-Art Mini Liquid Nitrogen Cooled Mini-Mortar set (H37260-0100) The pestle did not reach the bottom of the tube and the tissue got stuck at the bottom, so I did not achieve the desired result. I used regular 1.5ml Eppendorf tubes. Could you please advise me on what can be done about it? Thanks. - Olga M.
July 19, 2018
Image: Reusable / Disposable Desiccator Cartridges in Polystyrene Slide Boxes - Ask Lab Guy - SP Scienceware

Low Humidity Storage for Microscope Slides

Hi Lab Guy, Our customer needs to seal in a desiccator, slides with samples that needs to be transported. We would like to know the best way to do this and if you have a small desiccator with a sort of "rack" for slides. Thank you for your help. - Anna C.
July 12, 2018
Image: Bel-Art Poly-Hand 5 Gal. Carboy Polyethylene Pump - SP Scienceware - Ask Lab Guy

Pumping an Acidic Solution

Dear Lab Guy, I am trying to set up a recirculating system for an acid bath for etching zinc plates for a traditional printmaking process. We are using approximately 4.5 gallons of water and 0.5 gallons of concentrated nitric acid, so it seemed like your hand pump H32787-0000 and 5-gallon carboy F10795-0000 might be a good starting point. Approximately what volume is delivered per stroke at a low head like a foot or two? Alternatively, how many strokes to empty? Also, would it be acceptable to leave the pump in the acid indefinitely? Thank you for your assistance. - Walt P.