We offer a broad selection of Thermo Scientific™ DNA ladders with fragment sizes ranging from 10 bp to 48.5 kb, for accurate analysis of linear double-stranded DNA in agarose or polyacrylamide gels. DNA ladders are manufactured and quality controlled to supersede industry standards. DNA ladders are made of chromatography-purified individual DNA fragments using a proprietary technology for preparation of pharmaceutical-grade plasmid DNA. DNA ladders are stable during prolonged incubation at room temperature and multiple freeze-thaw cycles.

GeneRuler™ and O'GeneRuler™ DNA Ladders

Ideal for sizing and approximate quantification of a wide range of double-stranded DNA. Supplied in standard and ready-to-use formats.

MassRuler™ DNA Ladders

Specially designed for accurate quantification and sizing of DNA fragments in agarose gels.

Lambda, Phage, and Plasmid DNA Markers

Conventional DNA molecular weight markers.

FastRuler™ DNA Ladders

Fast-separating ladders, designed for accurate sizing of double-stranded DNA (especially PCR products) in conventional, 48- or 96-well high-throughput gels.

Express DNA Ladders

Fast-separating versions of our popular ladders, designed for fast and accurate sizing under a range of electrophoresis conditions.

Loading Dyes, Agarose, and Buffers

Convenient reagents and buffers to achieve optimal electrophoresis results.

O’RangeRuler™ DNA Ladders

Step-ladders with exact repeats of a DNA fragment, designed for precise sizing of DNA in agarose or non-denaturing polyacrylamide gels.

NoLimits™ DNA Fragments

Individual, highly purified DNA fragments, useful for researchers wanting to create custom ladders.

Thermo Scientific™ DNA Ladder selection guide

  Range, bp Agarose gel resolution time Origin Formulation Loading dyes supplied
NoLimits™ Custom DNA Ladders 10-20,000 Composition dependent Individual, chromatography-purified DNA fragments In TE buffer or ready-to-use Any Thermo Scientific™ loading dye upon request
GeneRuler™ and O'GeneRuler™ DNA Ladders 10-48,502 10 min–1.5 hr Mixtures of individual, chromatography-purified DNA fragments In TE buffer or ready-to-use 6X DNA Loading Dye or 6X Orange Loading Dye
MassRuler™ DNA Ladders 80-10,000 10–45 min Mixtures of individual, chromatography-purified DNA fragments Ready-to-use 6X MassRuler™ Loading Dye
FastRuler™ DNA Ladders 10-10,000 8–14 min Mixtures of 5 individual, chromatography-purified DNA fragments Ready-to-use 6X MassRuler™ Loading Dye, 6X Orange Loading Dye
O'RangeRuler™ DNA Ladders 10-6,000 45 min–1.5 hr Ligated 5, 10, 15, 20, 50, 100, 200, 500 bp DNA fragments Ready-to-use 6X Orange Loading Dye
ZipRuler™ Express DNA Ladders 100-20,000 10–20 min Mixtures of individual, chromatography-purified DNA fragments Ready-to-use 6X Orange Loading Dye, 6X MassRuler™ Loading Dye
Conventional DNA Markers 8-23,130 45 min–18 hr Digested lambda, phage and plasmid DNA In TE buffer or ready-to-use 6X DNA Loading Dye