Consumables for the Cressington Coaters, MTM systems and Vacuum Pumps


Introduction

Full range of consumables and maintenance replacement parts for the Cressington coating systems:

  • 108 series SEM sputter coaters
  • 108 series SEM/EDX carbon coaters
  • 208HR series high resolution turbo sputter coaters
  • 208carbon high vacuum turbo carbon coaters
  • MTM-10/20 thickness monitor/controller
  • Vacuum pumping systems

 

Ordering information for consumables for 108 series sputter coater and 108 series carbon coater

*Prices without VAT, but within the EU, we have to check for valid VAT-ID.
  
Replacement glass chamber Ø120x120mm (108manual, 108auto & 108carbon/A) Replacement glass chamber Ø120x120mm (108manual, 108auto & 108carbon/A)
Product # Unit Price* Add to Quote / Order
64-010451 each €200,00
Qty:

 

Replacement glass chamber Ø120x44mm for 108 R-T stage Replacement glass chamber Ø120x44mm for 108 R-T stage
Product # Unit Price* Add to Quote / Order
64-010453 each €135,00
Qty:

 

Replacement O-rings for Ø120mm diameter glass chamber Replacement O-rings for Ø120mm diameter glass chamber
Product # Unit Price* Add to Quote / Order
64-010454 pkg/2 €9,00
Qty:

 

Replacement O-rings for Ø150mm diameter glass chamber Replacement O-rings for Ø150mm diameter glass chamber
Product # Unit Price* Add to Quote / Order
64-012450 pkg/2 €22,00
Qty:

 

Replacement glass chamber Ø150x150mm (108auto/SE, 108carbon/A/SE, 208HR, 208carbon) Replacement glass chamber Ø150x150mm (108auto/SE, 108carbon/A/SE, 208HR, 208carbon)
Product # Unit Price* Add to Quote / Order
64-012452 each €289,00
Qty:

 

Replacement glass chamber Ø150x65mm for R-T and R-P-T stages (108auto/SE, 108carbon/A/SE, 208HR, 208carbon) Replacement glass chamber Ø150x65mm for R-T and R-P-T stages (108auto/SE, 108carbon/A/SE, 208HR, 208carbon)
Product # Unit Price* Add to Quote / Order
64-012453 each €175,00
Qty:

 

Replacement Aluminium distance ring  Ø150x15mm for R-T and R-P-T stages Replacement Aluminium distance ring Ø150x15mm for R-T and R-P-T stages
Product # Unit Price* Add to Quote / Order
64-012455 each €195,00
Qty:

 

Static table with M6 height adjuster for Cressington 108 and 208 systems Static table with M6 height adjuster for Cressington 108 and 208 systems
Product # Unit Price* Add to Quote / Order
64-012456 each €157,50
Qty:

 

Manual carbon rod shaper to make  Ø6.15 stepped carbon rods Manual carbon rod shaper to make Ø6.15 stepped carbon rods
Product # Unit Price* Add to Quote / Order
64-010461 each €170,00
Qty:

 

Ultra high purity double sided profile-stepped carbon rods Ø6.15x42mm for Cressington carbon coaters Ultra high purity double sided profile-stepped carbon rods Ø6.15x42mm for Cressington carbon coaters
Product # Unit Price* Add to Quote / Order
70-CC0606 pkg/10 €72,50
Qty:

 

Ultra-high purity carbon rods 6.15mm x 305mm long, grade F-A Ultra-high purity carbon rods 6.15mm x 305mm long, grade F-A
Product # Unit Price* Add to Quote / Order
70-CC0602 pack/10 €95,50
Qty:

 

Replacement spring for Bradley carbon source Replacement spring for Bradley carbon source
Product # Unit Price* Add to Quote / Order
64-010466 pkg/5 €54,00
Qty:

 

Replacement copper braid for Bradley carbon source Replacement copper braid for Bradley carbon source
Product # Unit Price* Add to Quote / Order
64-010467 pkg/5 €79,50
Qty:

 

Replacement ceramic insulation rings for Bradley carbon source Replacement ceramic insulation rings for Bradley carbon source
Product # Unit Price* Add to Quote / Order
64-010468 pkg/4 €45,00
Qty:

 

Replacement teflon feedthrough kit for Bradley carbon source Replacement teflon feedthrough kit for Bradley carbon source
Product # Unit Price* Add to Quote / Order
64-010469 each €60,00
Qty:

 

Replacement carbon rod slider for Bradley carbon source Replacement carbon rod slider for Bradley carbon source
Product # Unit Price* Add to Quote / Order
64-010470 each €170,00
Qty:

 

Replacement Bradley carbon source for 108carbonA/SE and 208Carbon coaters Replacement Bradley carbon source for 108carbonA/SE and 208Carbon coaters
Product # Unit Price* Add to Quote / Order
64-010477 each €820,00
Qty:

 

Carbon fibre evaporation source for Cressington 108carbonA with offset carbon source (2022 and later) Carbon fibre evaporation source for Cressington 108carbonA with offset carbon source (2022 and later)
Product # Unit Price* Add to Quote / Order
64-010481 each €736,00
Qty:

 

Carbon fibre evaporation source for Cressington 108carbonA/SE and 208Carbon coaters Carbon fibre evaporation source for Cressington 108carbonA/SE and 208Carbon coaters
Product # Unit Price* Add to Quote / Order
64-010482 each €754,00
Qty:

 

Replacement Pirani vacuum gauge head for 108/108SE systems Replacement Pirani vacuum gauge head for 108/108SE systems
Product # Unit Price* Add to Quote / Order
64-010427 each €362,50
Qty:

 

Replacement feedthrough electrode for Bradley carbon source, supplied until mid/end 2022 Replacement feedthrough electrode for Bradley carbon source, supplied until mid/end 2022
Product # Unit Price* Add to Quote / Order
64-010471 each €135,00
Qty:

 

Static rod holder frame part of the Bradley carbon source Static rod holder frame part of the Bradley carbon source
Product # Unit Price* Add to Quote / Order
64-010472 each €250,00
Qty:

 

Moving rod frame part of the Bradley carbon source Moving rod frame part of the Bradley carbon source
Product # Unit Price* Add to Quote / Order
64-010473 each €295,00
Qty:

 

Slider nut with washers for Bradley carbon source Slider nut with washers for Bradley carbon source
Product # Unit Price* Add to Quote / Order
64-010474 each €15,00
Qty:

 

Replacement Bradley carbon source for 108Carbon/A, 108Carbon/A/SE and 208Carbon coaters Replacement Bradley carbon source for 108Carbon/A, 108Carbon/A/SE and 208Carbon coaters
Product # Unit Price* Add to Quote / Order
64-010475 each €805,00
Qty:

 

Bracket for Bradley carbon source Bracket for Bradley carbon source
Product # Unit Price* Add to Quote / Order
64-010476 each €14,00
Qty:

 

Replacement Pirani vacuum gauge head for 208HR systems Replacement Pirani vacuum gauge head for 208HR systems
Product # Unit Price* Add to Quote / Order
64-012427 each €362,50
Qty:

 

New style replacement feedthrough electrode for Bradley carbon source, supplied since mid 2022 New style replacement feedthrough electrode for Bradley carbon source, supplied since mid 2022
Product # Unit Price* Add to Quote / Order
64-011471 each €135,00
Qty:

 


Ordering information for for sputter targets for the Cressington sputter coaters

*Prices without VAT, but within the EU, we have to check for valid VAT-ID.
  
Ø57mm disc type high purity EM-Tec sputter targets for sputter coaters Ø57mm disc type high purity EM-Tec sputter targets for sputter coaters
Product # Unit Price* Add to Quote / Order
70-AG5710 Silver Sputter Target, Ø57 x 0.25mm Disc, 99.99% Ag
Qty:

each €190,00
70-AL5710 Aluminium Sputter Target, Ø57 x 0.25mm Disc, 99.999% Al
Qty:

each €150,00
70-AP5704 Gold/Palladium Sputter Target, Ø57 x 0.1mm Disc, 60/40 Au/Pd, 99.99% Au/Pd
Qty:

each €735,00
70-AP5705 Gold/Palladium Sputter Target, Ø57 x 0.1mm Disc, 80/20 Au/Pd, 99.99% Au/Pd
Qty:

each €795,00
70-AP5708 Gold/Palladium Sputter Target, Ø57 x 0.2mm Disc, 60/40 Au/Pd, 99.99% Au/Pd
Qty:

each €1315,00
70-AP5709 Gold/Palladium Sputter Target, Ø57 x 0.2mm Disc, 80/20 Au/Pd, 99.99% Au/Pd
Qty:

each €1450,00
70-AU5704 Gold Sputter Target, Ø57 x 0.1mm Disc, 99.99% Au
Qty:

each €799,00
70-AU5708 Gold Sputter Target, Ø57 x 0.2mm Disc, 99.99% Au
Qty:

each €1555,00
70-AU5712 Gold Sputter Target, Ø57 x 0.3mm Disc, 99.99% Au
Qty:

each €2388,00
70-AU5716 Gold Sputter Target, Ø57 x 0.4mm Disc, 99.99% Au
Qty:

each €2895,00
70-CO5704 Cobalt Sputter Target, Ø57 x 0.1mm Disc, 99.99% Co
Qty:

each €175,00
70-CO5720 Cobalt Sputter Target, Ø57 x 0.5mm Disc, 99.99% Co
Qty:

each €516,00
70-CR5720 Chromium Sputter Target, Ø57 x 0.5mm Disc, 99.95% Cr
Qty:

each €495,00
70-CR5799 Chromium Sputter Target, Ø57 x 3.2mm Disc, 99.99% Cr
Qty:

each €590,00
70-CU5710 Copper Sputter Target, Ø57 x 0.25mm Disc, 99.99% Cu
Qty:

each €150,00
70-FE5704 Iron Sputter Target, Ø57 x 0.1mm, 99.5% Fe
Qty:

each €175,00
70-IN5720 Indium Sputter Target, Ø57 x 0.5mm Disc, 99.99% In
Qty:

each €250,00
70-IR5704 Iridium Sputter Target, Ø57 x 0.1mm Disc, 99.99% Ir
Qty:

each €3625,00
70-IR5712 Iridium Sputter Target, Ø57 x 0.3mm Disc, 99.99% Ir
Qty:

each €8335,00
70-IT7099 ITO (Indium Tin Oxide) Sputter Target Ø57 x 3.0mm Disc, including 1mm thick copper backing plate, 90/10 Wt% In2O3/SnO2, 99.99%
Qty:

each €1125,00
70-MG5704 Magnesium Sputter Target, Ø57 x 0.10mm Disc, 99.99% Mg
Qty:

each €75,00
70-MO5710 Molydenum Sputter Target, Ø57 x 0.25mm Disc, 99.95% Mo
Qty:

each €245,70
70-NB5710 Niobium Sputter Target, Ø57 x 0.20mm Disc, 99.98% Nb
Qty:

each €205,00
70-NI5703 Nickel Sputter Target, Ø57 x 0.075mm, 99.98% Ni
Qty:

each €175,00
70-PB5708 Lead Target, Ø57 x 0.20mm Disc, 99.99% Pb
Qty:

each €95,00
70-PD5704 Palladium Sputter Target, Ø57 x 0.1mm Disc, 99.99% Pd
Qty:

each €655,00
70-PD5708 Palladium Sputter Target, Ø57 x 0.2mm Disc, 99.99% Pd
Qty:

each €1020,00
70-PP5704 Platinum/Palladium Sputter Target, Ø57 x 0.1mm Disc, 80/20 Pt/Pd 99.99% Pt/Pd
Qty:

each €595,00
70-PP5708 Platinum/Palladium Sputter Target, Ø57 x 0.2mm Disc, 80/20 Pt/Pd 99.99% Pt/Pd
Qty:

each €1075,00
70-PT5704 Platinum Sputter Target, Ø57 x 0.1mm Disc, 99.99% Pt
Qty:

each €600,00
70-PT5708 Platinum Sputter Target, Ø57 x 0.2mm Disc, 99.99% Pt
Qty:

each €978,00
70-SN5708 Tin Sputter Target, Ø57 x 0.20mm Disc, 99.99% Sn
Qty:

each €80,00
70-SN5720 Tin Sputter Target, Ø57 x 0.50mm Disc, 99.99% Sn
Qty:

each €150,00
70-TA5710 Tantalum Sputter Target, Ø57 x 0.20mm Disc, 99.95% Ta
Qty:

each €365,40
70-TI5710 Titanium Sputter Target, Ø57 x 0.2mm Disc, 99.99% Ti
Qty:

each €140,00
70-VA5708 Vanadium Sputter Target, Ø57 x 0.20mm Disc, 99.99% V
Qty:

each €199,00
70-WO5710 Tungsten Sputter Target, Ø57 x 0.25mm Disc, 99.95% W
Qty:

each €308,70
70-ZN5708 Zinc Sputter Target, Ø57 x 0.20mm Disc, 99.99% Zn
Qty:

each €95,00
70-ZN5720 Zinc Sputter Target, Ø57 x 0.5mm Disc, 99.5% Zn
Qty:

each €55,00
70-ZR5708 Zirconium Z702 Sputter Target, Ø57 x 0.20mm Disc, 99.2% Zr (+Hf)
Qty:

each €365,00

 


Ordering information consumables for the Cressington MTM-10/20 thickness monitor/controller

*Prices without VAT, but within the EU, we have to check for valid VAT-ID.
  
Quartz crystals for MTM-10 and MTM-20 thickness measurement systems, 6MHz, Ø14mm Quartz crystals for MTM-10 and MTM-20 thickness measurement systems, 6MHz, Ø14mm
Product # Unit Price* Add to Quote / Order
64-010835 box/10 €123,50
Qty:

 

Cressington MTM-10 Thickness Monitor Box (control unit only) Cressington MTM-10 Thickness Monitor Box (control unit only)
Product # Unit Price* Add to Quote / Order
64-010831 each €1148,00
Qty:

 

External BNC cable for Cressington MTM units, BNC/BNC External BNC cable for Cressington MTM units, BNC/BNC
Product # Unit Price* Add to Quote / Order
64-010839 each €22,00
Qty:

 

Internal BNC cable for Cressington coaters, complete with backpanel connection, BNC/BNC Internal BNC cable for Cressington coaters, complete with backpanel connection, BNC/BNC
Product # Unit Price* Add to Quote / Order
64-010834 each €100,00
Qty:

 

Oscillator unit for Cressington MTM10/20 systems Oscillator unit for Cressington MTM10/20 systems
Product # Unit Price* Add to Quote / Order
64-010836 each €235,00
Qty:

 

Cressington RF10 vacuum feedthrough for MTM10/20 systems Cressington RF10 vacuum feedthrough for MTM10/20 systems
Product # Unit Price* Add to Quote / Order
64-010837 each €280,00
Qty:

 

Crystal holder cable 19cm long (SMB/SMB connector) for static table Crystal holder cable 19cm long (SMB/SMB connector) for static table
Product # Unit Price* Add to Quote / Order
64-010832 each €59,00
Qty:

 

Crystal holder cable 30cm long (SMB/SMB connector) for R-T and R-P-T stages Crystal holder cable 30cm long (SMB/SMB connector) for R-T and R-P-T stages
Product # Unit Price* Add to Quote / Order
64-010833 each €69,00
Qty:

 

Crystal head for the MTM-10/20 thickness monitor/controller Crystal head for the MTM-10/20 thickness monitor/controller
Product # Unit Price* Add to Quote / Order
64-010838 each €315,00
Qty:

 


Ordering information consumables for the vacuum systems

*Prices without VAT, but within the EU, we have to check for valid VAT-ID.
  
Oil mist filter for the Pfeiffer DUO 2.5 and DUO 3 series rotary pumps, 1/4 inch NPT thread connection Oil mist filter for the Pfeiffer DUO 2.5 and DUO 3 series rotary pumps, 1/4 inch NPT thread connection
Product # Unit Price* Add to Quote / Order
64-010425 pkg/5 €355,00
Qty:

64-010425-1 pkg/1 €79,50
Qty:

 

Service bearing grease kit with syringe for Alcatel/Adixen MDP5011 & ATP80 pumps used on Cressington 208HR & 208Carbon Service bearing grease kit with syringe for Alcatel/Adixen MDP5011 & ATP80 pumps used on Cressington 208HR & 208Carbon
Product # Unit Price* Add to Quote / Order
64-012491 each €249,00
Qty:

Hazardous Symbol Explanation

hazard fee symbol = Hazard Shipping Fee
Cg = Suspected Carcinogen
F = Flammable
I = Irritant
S = Sensitizer
T = Toxic
Extra info 64-012491 :   SDS pdf download

 

Pfeiffer P3 vacuum pump oil for Pfeiffer UNO / DUO and other rotary vacuum pumps Pfeiffer P3 vacuum pump oil for Pfeiffer UNO / DUO and other rotary vacuum pumps
Product # Unit Price* Add to Quote / Order
64-001103-1 1 ltr €23,00
Qty:

Hazardous Symbol Explanation

hazard fee symbol = Hazard Shipping Fee
Cg = Suspected Carcinogen
F = Flammable
I = Irritant
S = Sensitizer
T = Toxic
Extra info 64-001103-1 :   SDS pdf download
64-001103-05 0.5 ltr €13,50
Qty:

Hazardous Symbol Explanation

hazard fee symbol = Hazard Shipping Fee
Cg = Suspected Carcinogen
F = Flammable
I = Irritant
S = Sensitizer
T = Toxic
Extra info 64-001103-05 :   SDS pdf download

 



Cross reference table for Cressington consumables with Cressington and Tescan GmbH part numbers.

Description

Micro to Nano #

Cressington #

Tescan GmbH (EOS) #

Replacement glass chamber Ø120x120mm for 108 series

64-010451

80500

P0130

Replacement glass chamber Ø120x44 mm for 108 R-T stage

64-010453

80503

19-010453

Replacement O-rings for Ø120mm diameter glass chamber

64-010454

80501

P0131

Replacement glass chamber Ø150x150mm for 108SE/208

64-012452

87010

P0200

Replacement glass chamber Ø150x65mm for R-T/RPT stage

64-012453

87011

P0203

Replacement O-rings for Ø150mm diameter glass chamber

64-012450

87015

P0211

Replacement Aluminium ring Ø150x15mm for R-T/RPT stage

64-012455

87012

P0204

Carbon rods Ø 6.15mm x 305mm long, grade F-A, pkg/10

70-CC0602

85103

P0142

Double sided profile stepped carbon rods Ø 6.15mm, pkg/10

70-CC0606

85001

P0141

Manual carbon rod shaper for carbon rods Ø 6.15mm

64-010461

30816

P0140

Replacement spring for Bradley carbon source (Pkg/5)

64-010466

85111

P0122

Replacement copper braid for Bradley carbon source (Pkg/5)

64-010467

85112

P0145

Replacement ceramic insulation rings for Bradley carbon source

64-010468

85113

P0146

Replacement teflon feedthrough kit for Bradley carbon source

64-010469

85114

P0354

Replacement feedthrough electrode for Bradley carbon source

64-010471

85115

Replacement carbon rod slider for Bradley carbon source

64-010470

85110

PO143

Static rod holder for Bradley carbon source

64-010472

85116

19-104760

Moving rod frame for Bradley carbon source

64-010473

85117

 

Slider Nut with washers for Bradley carbon source

64-010474

85118

 

Bracket for Bradley carbon source

64-010476

85118

 

Replacement Bradley carbon source for 108carbon

64-010475

85150

 

 

 

 

 

Quartz Crystals for MTM-10&MTM-20, 6MHZ, pkg/10

64-010835

21300

P0322

Crystal holder head for the MTM-10 & MTM-20 systems

64-010838

21301

P0321

Oscillator unit for MTM 10/20

64-010836

21101

PO356

RF10 Vacuum Feedthrough

64-010837

21104

PO148

Crystal holder cable 19cm long (SMB/SMB)

64-010832

21305

P0350

Crystal holder cable 30cm long (SMB/SMB) for RT/RPT

64-010833

21307

P0351

 

 

 

 

 

 

 

 

Rotary pump oil mist filter, pkg/5

64-010425

80156

P0114

P3 oil for Pfeiffer Rotary pump, 1 ltr

64-001103-1

81121

P0116

Replacement Pirani Gauge Head for 108/108SE

64-010427

80505

P0580

 

 

 

 

Gold Target ∅57 x 0.1mm

70-AU5704

81001

P0120-2

Gold Target ∅57 x 0.2mm

70-AU5708

81007

P0120

Gold Target ∅57 x 0.4mm

70-AU5716

 

P0120-1

Platinum Target ∅57 x 0.1mm

70-PT5704

81002

P0122

Gold/Palladium Target ∅57 x 0.1mm (80/20 wt% Au/Pd)

70-AP5705

81003

P0121

Gold/Palladium Target ∅57 x 0.2mm (80/20 wt% Au/Pd)

70-AP5709

81023

 

Platinum/Palladium Target ∅57 x 0.1mm (80/20wt% Pt/Pd)

70-PP5704

81006

P0128

Platinum/Palladium Target ∅57 x 0.2mm (80/20wt% Pt/Pd)

70-PP5708

81024

 

Silver Target ∅57 x 0.25mm

70-AG5710

 

P0123

Chromium Target ∅57 x 3.2mm

70-CR5799

81004

P0125

Iron Target ∅57 x 0.1mm

70-FE5704

 

P0150

Titanium Target ∅57 x 0.25mm

70-TI5710

 

P0151

Tin Target ∅57 x 0.2mm

70-SN5708

 

P0152

Zinc Target ∅57 x 0.2mm

70-Zn5708

 

P0153

Lead Target ∅57 x 0.2mm

70-PB5708

 

P0154



SEM Supplies

TEM Supplies

Calibration

Sample Preparation

AFM / SPM

  Product Menu with Images
  SEM Sample Stubs
  Carbon Tabs
  Sample Stub Adapters
  SEM Stage Adapters
  SEM Sample Holders
  SEM Preparation Stands
  Filaments / Cathodes
  Silicon Finder Grid
  Gatan 3View Pins
  FEI Volumescope Pins
  SEM Stub Storage Boxes
  Phenom Supplies
  JEOL NeoScope Supplies
  Hitachi TM Series Supplies
  Field & Lab Sampler Kits
  FlowView liquid sample Kit

Instruments

  Acoustic Enclosures
  Cressington SEM coaters
  TEM Sample Prep
  Diaphragm Pump
  Rotary vacuum Pump
  Precision diamond saw  
  TEM Grids
  TEM Support Films
  Silicon Nitride Films
  K-Kit Wet Cell Holder
  Graphene Films
  TEM Grid Boxes
  Cryo Grid Boxes
  TEM Sample Staining
  3mm Embedding Tubes
  Filaments/Cathodes
  Eyelash Manipulators

Cryo Supplies

  Cryo Grid Boxes
  Other Cryo Supplies

FIB Supplies

  FIB Lift-out Grids
  FIB Low Profile Stubs
  FIB Grid Holders
  FIB Pre-tilt Holders
  FIB Pre-tilt stubs
  FIB Grid Boxes
  SEM / FIB Magn. Calib.
  SEM Res. Test Spec.
  EDS / WDS Calibration
  TEM Calibration
  AFM / SPM Calibration
  LM Magn. Calibration

Vacuum Supplies

  Vacuum Gauges
  KF/NW Vacuum Parts
  KF/NW Vacuum Hoses
  ISO Vacuum flange parts
  Vacuum Oil and Grease
  Vacuum Sealant
  Diaphragm Pump
  Rotary vacuum Pump
  Vacuum Sample Storage
  Vacuum Pick-Up Pens

Sample Coating Supplies

  Sputter Targets
  Carbon Rods & Fibers
  Quartz QCM Crystals
  SEM Sample Coating Fluid

Evaporation Supplies

  Thermal Evaporation Sources
  Evaporation Materials
  Supports & Substrates
  SEM Preparation Stands
  Tweezers
  Probes & Picks
  Applicators & Swabs
  Plastic Transfer Pipettes
  Cutting Tools / Scissors
  Conductive Paint/Cement
  Conductive Tapes & Tabs
  Non-Conductive Adhesives
  Sample Storage
  Hand Tools
  Sorting Wire Mesh
  Preparation Surfaces
  Cleaning / Gloves
  Conductive Metal Powders
  Metallographic Sample Prep
  AFM/SPM Discs
  AFM/SPM Disc Pick-up Tool
  AFM/SPM Holders
  AFM/SPM Disc Storage
  Cantilever Tweezers
  AFM/SPM Discs Tweezers
  Nano-Tec Mica Discs
  HOPG Substrates

Light Microscopy

  Correlative Cover Slips
  Glass Microscope Slides
  Glass Cover Slips
  Quartz Microscope Slides
  Quartz Cover Slips
  Black Metal Slides
  Slide Storage Boxes
  LM Calibration
  Plastic Transfer Pipettes
  Optical Lens Tissue
  Glass Petri Dishes
  Digital Microscope
  PTFE Beakers