DNA gel image

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 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, bpAgarose gel resolution timeOriginFormulationLoading dyes supplied
NoLimits Custom DNA Ladders10-20,000Composition dependentIndividual, chromatography-purified DNA fragmentsIn TE buffer or ready-to-useAny Thermo Scientific loading dye upon request
GeneRuler and O'GeneRuler DNA Ladders10-48,50210 min–1.5 hrMixtures of individual, chromatography-purified DNA fragmentsIn TE buffer or ready-to-use6X DNA Loading Dye or 6X Orange Loading Dye
MassRuler DNA Ladders80-10,00010–45 minMixtures of individual, chromatography-purified DNA fragmentsReady-to-use6X MassRuler Loading Dye
FastRuler DNA Ladders10-10,0008–14 minMixtures of 5 individual, chromatography-purified DNA fragmentsReady-to-use6X MassRuler Loading Dye, 6X Orange Loading Dye
O'RangeRuler DNA Ladders10-6,00045 min–1.5 hrLigated 5, 10, 15, 20, 50, 100, 200, 500 bp DNA fragmentsReady-to-use6X Orange Loading Dye
ZipRuler Express DNA Ladders100-20,00010–20 minMixtures of individual, chromatography-purified DNA fragmentsReady-to-use6X Orange Loading Dye, 6X MassRuler Loading Dye
Conventional DNA Markers8-23,13045 min–18 hrDigested lambda, phage and plasmid DNAIn TE buffer or ready-to-use6X DNA Loading Dye